opinion: Justice Kennedy
  delivered the opinion of the Court.
  The petitioners are the United States Catholic Conference and the National Conference of Catholic Bishops. Both organizations were held in civil contempt for failure to comply with subpoenas duces tecum issued by the United States District Court for the Southern District of New York. The Conferences objected to issuance of the process, arguing, inter alia, that the District Court lacked subject-matter jurisdiction in the underlying suit. The Court of Appeals for the Second Circuit rejected this argument, ruling that a nonparty witness’ jurisdictional challenge is limited to a claim that the District Court lacks even colorable jurisdiction, a standard not met here. We granted certiorari to resolve whether a nonparty witness may defend against a civil contempt adjudication by challenging the subject-matter jurisdiction of the district court. 484 U. S. 975 (1987). We hold the nonparty witness may raise such a claim, and now reverse.
  I
  In the underlying action, Abortion Rights Mobilization, Inc., and others (ARM) sued to revoke the tax-exempt status of the Roman Catholic Church in the United States. ARM alleged that the Conferences had violated the rules governing their tax-exempt status by participating in. political activities. Specifically, ARM claimed that “the .Roman Catholic Church in the United States , in violation of the clear language and intent of the anti-electioneering provision of 26 U. S. C. § 501(c)(3), has engaged in a persistent and regular pattern of intervening in elections nationwide in favor of candidates who support the Church’s position on abortion and in opposition to candidates with opposing views.” Brief for Respondents 7-8. The Conferences were originally named as parties to this suit, but were later dismissed, leaving the Secretary of the Treasury and the Commissioner of Internal Revenue as the sole defendants.
  ARM served subpoenas on the Conferences in 1983, seeking extensive documentary evidence to support its claims. A series of court orders to produce, intertwined with other procedural motions, were followed by objections and refusals. These matters were extensively reported by the District Court. See Abortion Rights Mobilization, Inc. v. Regan, 544 F. Supp. 471 (1982) (ARM I); Abortion Rights Mobilization, Inc. v. Regan, 552 F. Supp. 364 (1982) (ARM II); Abortion Rights Mobilization, Inc. v. Regan, 603 F. Supp. 970 (1985) (ARM III); Abortion Rights Mobilization, Inc. v. Baker, 110 F. R. D. 337 (1986) (ARM IV). After the Conferences informed the court that they could not “in con-' science, comply with the subpoenas in question,” the court, which had made detailed orders including orders limiting discovery at the behest of the Conferences, found the Conferences in civil contempt. ARM TV, supra, at 337. The court assessed fines of $50,000 against each Conference for each day of further noncompliance. The Court of Appeals affirmed, stating that “the witnesses have standing to question only whether the District Court has a colorable basis for exercising subject matter jurisdiction . . . .” In re United States Catholic Conference, 824 F. 2d 156, 158 (1987). The order was stayed pending appeal, and the stay remains in effect.
  II.
  We hold that a nonparty witness can challenge the court’s lack of subject-matter jurisdiction in defense of a civil contempt citation, notwithstanding the absence of a final judgment in the underlying action. Federal Rule of Civil Procedure 45 grants a district court the power to issue subpoenas as to witnesses and documents, but the subpoena power of a court cannot be more extensive than its jurisdiction. It follows that if a district court does not have subject-matter jurisdiction over the underlying action, and the process was not issued in aid of determining that jurisdiction, then the process is void and an order of civil contempt based on refusal to honor it must be reversed. As we observed in United States v. Morton Salt Co., 338 U. S. 632, 642 (1950), “[t]he judicial subpoena power not only is subject to specific constitutional limitations, . . . but also is subject to those limitations inherent in the body that issues them- because of the provisions of the Judiciary Article of the Constitution.” Therefore, a nonparty witness may attack a civil contempt citation by asserting that the issuing court lacks jurisdiction over the case.
  The right of a nonparty to appeal an adjudication of contempt cannot be questioned. The order finding a nonparty witness in contempt is appealable notwithstanding the absence of a final judgment in the underlying action. United States v. Ryan, 402 U. S. 530, 532 (1971); Cobbledick v. United States, 309 U. S. 323, 328 (1940). Once the right to appeal a civil contempt order is acknowledged, arguments in its legitimate support should not be so confined that the power of the issuing court remains untested. We are not confronted here with a nonparty witness attempting to challenge its civil contempt by raising matters in which it has no legitimate interest, for instance the District Court’s lack of personal jurisdiction over the parties or a limitations statute that would compel dismissal of the action. As to such matters, even if it were ultimately determined that the court should not have allowed the suit to proceed, the order or process it issued in the conduct of the litigation would still be valid.
  The challenge in this case goes to the subject-matter jurisdiction of the court and hence its power to issue the order. The distinction between subject-matter jurisdiction and waivable defenses is not a mere nicety of legal metaphysics. It rests instead on the central principle of a free society that courts have finite bounds of authority, some of constitutional origin, which exist to protect citizens from the very wrong asserted here, the excessive use of judicial power. The courts, no less than the political branches of the government, must respect the limits of their authority.
  The Court of Appeals found that our decision in Blair v. United States, 250 U. S. 273 (1919), controlled its decision, but we think not. Blair involved defiant witnesses in a grand jury investigation. The witnesses refused to testify, contending the grand jury lacked jurisdiction because the statute that prohibited the conduct under investigation was unconstitutional. Id., at 277-279. We affirmed the denial of habeas corpus relief to the witnesses and refused to consider their jurisdictional challenge. As this Court was careful to say, the jurisdiction of the grand jury did not depend upon the validity of the statutes attacked by the witnesses. The grand jury’s investigative powers included the authority to conduct a wide-ranging investigation of the subject matter and existed independently of the statutes challenged by the witnesses. Blair, in effect, addressed the jurisdiction of the grand jury and found it sufficient to support the order of contempt. See Morton Salt, supra, at 642-643. Blair does not hold that the limited subject-matter jurisdiction of an Article III court may not be raised by a nonparty witness whom the court seeks to hold in civil contempt.
  Additionally, the Court of Appeals was concerned that permitting the nonparty witness to challenge the jurisdiction of the court would invite .collusion, allowing parties to avoid restrictions on interlocutory appeals and to test jurisdiction by proxy. See Catlin v. United States, 324 U. S. 229, 236 (1946). We are not persuaded that such considerations should alter the rule we apply in this case. To begin with, the objection does not meet the fundamental premise that the nonparty should not be denied the right to object to the very jurisdictional exercise that causes the injury. Further, we conclude that there are ample protections against collusive appeals. If the Court of Appeals finds that the witness and a party acted in collusion to appeal in order to gain an interlocutory ruling on jurisdiction, it can decline to treat the witness as a nonparty for purposes of the question. Cf. Karcher v. May, 484 U. S. 72, 78 (1987) (applying “[t]he concept of ‘legal personage’ ” as a “practical means of identifying the real interests at stake in a lawsuit”); Bender v. Williamsport Area School District, 475 U. S. 634, 648, n. 9 (1986) (assessing the congruence of interests between the “parties” to the appeal). See generally In re Coordinated Pretrial Proceedings in Petroleum Products Antitrust Litigation, 747 F. 2d 1303, 1305 (CA9 1984); Additionally, there remain the usual provisions for sanctioning frivolous appeals or the abuse of court processes. See Roadway Express, Inc. v. Piper, 447 U. S. 752, 762 (1980); Fed. Rule App. Proc. 38.
  The limitations of the rule we follow in this case should be well understood. First, we do not undertake to explore in detail the differences between civil and criminal contempt. It suffices to note that we have distinguished between the two before and have held that a civil contempt order may depend upon the jurisdiction of the court. In United States v. Mine Workers, 330 U. S. 258 (1947), we noted the different treatment criminal and civil contempt are accorded based on appellate review of the issuing court’s jurisdiction.
  “It does not follow, of course, that simply because a defendant may be punished for criminal contempt for disobedience of an order later set aside on appeal, that the plaintiff in the action may profit by way of a fine imposed in a simultaneous proceeding for civil contempt based upon a violation of the same order. The right to remedial relief falls with an injunction which events prove was erroneously issued, and a fortiori when the injunc- ■ tion or restraining order was beyond the jurisdiction of the court.” Id., at 294-295 (citations omitted; footnote omitted).
  Though it may seem at first that denying a defense in a criminal case and granting it in a civil one reverses our usual priorities, the distinction is sound; for it rests on the different purposes and necessities of the two types of orders. Ibid. If either of the two orders appears efficacious, the better practice is to enter civil contempt to persuade a party to comply, reserving the more drastic, punitive sanction only if disobedience continues. Yates v. United States, 355 U. S. 66, 74-75 (1957). That course of action is not always available to a court, which at times must assert its authority at once to preserve the status quo or to determine its jurisdiction. See 18 U. S. C. §§401, 402. It was available here, however, as the District Court correctly recognized. When a district court elects to apply civil contempt to enforce compliance, it is consistent with that approach to allow full consideration of the court’s subject-matter jurisdiction.
  The second point is closely related. Nothing we have said puts in question the inherent and legitimate authority of the court to issue process and other binding orders, including orders of discovery directed to nonparty witnesses, as necessary for the court to determine and rule upon its own jurisdiction, including jurisdiction over the subject matter. United States v. Shipp, 203 U. S. 563, 573 (1906).
  Though the concurring opinion in the Court of Appeals indicated that the order of the District Court in the case before us might be sustained as an inquiry in aid of the court’s jurisdiction over the subject matter, the record shows that the process was issued to obtain discovery on the merits of the litigation. It is a recognized and appropriate procedure for a court to limit discovery proceedings at the outset to a determination of jurisdictional matters, see 13A C. Wright, A. Miller, & E. Cooper, Federal Practice and Procedure §3536, and n. 2 (1984 and Supp. 1987), but that was not the objective of this discovery order, even by implication. Before the contempt order, the District Court twice ruled that it had subject-matter jurisdiction of the case.
  Accordingly, on remand, the Court of Appeals must determine whether the District Court had subject-matter jurisdiction in the underlying action. If not, then the subpoenas duces tecum are void, and the civil contempt citation must be reversed “in its entirety.” Mine Workers, supra, at 295.
  III
  We hold that the Court of Appeals for thé Second Circuit erred in limiting the Conferences’ jurisdictional challenge to the argument that the District Court lacked even colorable jurisdiction to hear the suit. The judgment of the Court of Appeals is therefore reversed, and the case is remanded for further proceedings consistent with this opinion.
  It is so ordered.
  The Internal Revenue Code, 26 U. S. C. § 501(c)(3) (1988 ed.), as amended by Pub. L. 100-203, § 10711(a)(2), 101 Stat. 1330-464, exempts organizations from the payment of income taxes if they meet certain criteria. In pertinent part, that section provides:
  “(c) List of exempt organizations. — The following organizations are referred to in subsection (a) [as exempt from taxation]:
  “(3) Corporations, and any community chest, fund, or foundation, organized and operated exclusively for religious, charitable, scientific, testing for public safety, literary, or educational purposes, or to foster national or international amateur sports competition (but only if no part of its activities involve the provision of athletic facilities or equipment), or for the prevention of cruelty to children or animals, no part of the net earnings of which inures to the benefit of any private shareholder or individual, no substantial part of the activities of which is carrying on propaganda, or otherwise attempting, to influence legislation (except as otherwise provided in subsection (h)), and which does not participate in, or intervene in (including the publishing or distributing of statements), any political campaign on behalf of (or in opposition to) any candidate for public office.”
choices: attorney general of the United States, or his office specified state board or department of education city, town, township, village, or borough government or governmental unit state commission, board, committee, or authority county government or county governmental unit, except school district court or judicial district state department or agency governmental employee or job applicant female governmental employee or job applicant minority governmental employee or job applicant minority female governmental employee or job applicant not listed among agencies in the first Administrative Action variable retired or former governmental employee U.S. House of Representatives interstate compact judge state legislature, house, or committee local governmental unit other than a county, city, town, township, village, or borough governmental official, or an official of an agency established under an interstate compact state or U.S. supreme court local school district or board of education U.S. Senate U.S. senator foreign nation or instrumentality state or local governmental taxpayer, or executor of the estate of state college or university United States State person accused, indicted, or suspected of crime advertising business or agency agent, fiduciary, trustee, or executor airplane manufacturer, or manufacturer of parts of airplanes airline distributor, importer, or exporter of alcoholic beverages alien, person subject to a denaturalization proceeding, or one whose citizenship is revoked American Medical Association National Railroad Passenger Corp. amusement establishment, or recreational facility arrested person, or pretrial detainee attorney, or person acting as such;includes bar applicant or law student, or law firm or bar association author, copyright holder bank, savings and loan, credit union, investment company bankrupt person or business, or business in reorganization establishment serving liquor by the glass, or package liquor store water transportation, stevedore bookstore, newsstand, printer, bindery, purveyor or distributor of books or magazines brewery, distillery broker, stock exchange, investment or securities firm construction industry bus or motorized passenger transportation vehicle business, corporation buyer, purchaser cable TV car dealer person convicted of crime tangible property, other than real estate, including contraband chemical company child, children, including adopted or illegitimate religious organization, institution, or person private club or facility coal company or coal mine operator computer business or manufacturer, hardware or software consumer, consumer organization creditor, including institution appearing as such; e.g., a finance company person allegedly criminally insane or mentally incompetent to stand trial defendant debtor real estate developer disabled person or disability benefit claimant distributor person subject to selective service, including conscientious objector drug manufacturer druggist, pharmacist, pharmacy employee, or job applicant, including beneficiaries of employer-employee trust agreement, employee health and welfare fund, or multi-employer pension plan electric equipment manufacturer electric or hydroelectric power utility, power cooperative, or gas and electric company eleemosynary institution or person environmental organization employer. If employer's relations with employees are governed by the nature of the employer's business (e.g., railroad, boat), rather than labor law generally, the more specific designation is used in place of Employer. farmer, farm worker, or farm organization father female employee or job applicant female movie, play, pictorial representation, theatrical production, actor, or exhibitor or distributor of fisherman or fishing company food, meat packing, or processing company, stockyard foreign (non-American) nongovernmental entity franchiser franchisee lesbian, gay, bisexual, transexual person or organization person who guarantees another's obligations handicapped individual, or organization of devoted to health organization or person, nursing home, medical clinic or laboratory, chiropractor heir, or beneficiary, or person so claiming to be hospital, medical center husband, or ex-husband involuntarily committed mental patient Indian, including Indian tribe or nation insurance company, or surety inventor, patent assigner, trademark owner or holder investor injured person or legal entity, nonphysically and non-employment related juvenile government contractor holder of a license or permit, or applicant therefor magazine male medical or Medicaid claimant medical supply or manufacturing co. racial or ethnic minority employee or job applicant minority female employee or job applicant manufacturer management, executive officer, or director, of business entity military personnel, or dependent of, including reservist mining company or miner, excluding coal, oil, or pipeline company mother auto manufacturer newspaper, newsletter, journal of opinion, news service radio and television network, except cable tv nonprofit organization or business nonresident nuclear power plant or facility owner, landlord, or claimant to ownership, fee interest, or possession of land as well as chattels shareholders to whom a tender offer is made tender offer oil company, or natural gas producer elderly person, or organization dedicated to the elderly out of state noncriminal defendant political action committee parent or parents parking lot or service patient of a health professional telephone, telecommunications, or telegraph company physician, MD or DO, dentist, or medical society public interest organization physically injured person, including wrongful death, who is not an employee pipe line company package, luggage, container political candidate, activist, committee, party, party member, organization, or elected official indigent, needy, welfare recipient indigent defendant private person prisoner, inmate of penal institution professional organization, business, or person probationer, or parolee protester, demonstrator, picketer or pamphleteer (non-employment related), or non-indigent loiterer public utility publisher, publishing company radio station racial or ethnic minority person or organization protesting racial or ethnic segregation or discrimination racial or ethnic minority student or applicant for admission to an educational institution realtor journalist, columnist, member of the news media resident restaurant, food vendor retarded person, or mental incompetent retired or former employee railroad private school, college, or university seller or vendor shipper, including importer and exporter shopping center, mall spouse, or former spouse stockholder, shareholder, or bondholder retail business or outlet student, or applicant for admission to an educational institution taxpayer or executor of taxpayer's estate, federal only tenant or lessee theater, studio forest products, lumber, or logging company person traveling or wishing to travel abroad, or overseas travel agent trucking company, or motor carrier television station union member unemployed person or unemployment compensation applicant or claimant union, labor organization, or official of veteran voter, prospective voter, elector, or a nonelective official seeking reapportionment or redistricting of legislative districts (POL) wholesale trade wife, or ex-wife witness, or person under subpoena network slave slave-owner bank of the united states timber company u.s. job applicants or employees Army and Air Force Exchange Service Atomic Energy Commission Secretary or administrative unit or personnel of the U.S. Air Force Department or Secretary of Agriculture Alien Property Custodian Secretary or administrative unit or personnel of the U.S. Army Board of Immigration Appeals Bureau of Indian Affairs Bonneville Power Administration Benefits Review Board Civil Aeronautics Board Bureau of the Census Central Intelligence Agency Commodity Futures Trading Commission Department or Secretary of Commerce Comptroller of Currency Consumer Product Safety Commission Civil Rights Commission Civil Service Commission, U.S. Customs Service or Commissioner of Customs Defense Base Closure and REalignment Commission Drug Enforcement Agency Department or Secretary of Defense (and Department or Secretary of War) Department or Secretary of Energy Department or Secretary of the Interior Department of Justice or Attorney General Department or Secretary of State Department or Secretary of Transportation Department or Secretary of Education U.S. Employees' Compensation Commission, or Commissioner Equal Employment Opportunity Commission Environmental Protection Agency or Administrator Federal Aviation Agency or Administration Federal Bureau of Investigation or Director Federal Bureau of Prisons Farm Credit Administration Federal Communications Commission (including a predecessor, Federal Radio Commission) Federal Credit Union Administration Food and Drug Administration Federal Deposit Insurance Corporation Federal Energy Administration Federal Election Commission Federal Energy Regulatory Commission Federal Housing Administration Federal Home Loan Bank Board Federal Labor Relations Authority Federal Maritime Board Federal Maritime Commission Farmers Home Administration Federal Parole Board Federal Power Commission Federal Railroad Administration Federal Reserve Board of Governors Federal Reserve System Federal Savings and Loan Insurance Corporation Federal Trade Commission Federal Works Administration, or Administrator General Accounting Office Comptroller General General Services Administration Department or Secretary of Health, Education and Welfare Department or Secretary of Health and Human Services Department or Secretary of Housing and Urban Development Interstate Commerce Commission Indian Claims Commission Immigration and Naturalization Service, or Director of, or District Director of, or Immigration and Naturalization Enforcement Internal Revenue Service, Collector, Commissioner, or District Director of Information Security Oversight Office Department or Secretary of Labor Loyalty Review Board Legal Services Corporation Merit Systems Protection Board Multistate Tax Commission National Aeronautics and Space Administration Secretary or administrative unit of the U.S. Navy National Credit Union Administration National Endowment for the Arts National Enforcement Commission National Highway Traffic Safety Administration National Labor Relations Board, or regional office or officer National Mediation Board National Railroad Adjustment Board Nuclear Regulatory Commission National Security Agency Office of Economic Opportunity Office of Management and Budget Office of Price Administration, or Price Administrator Office of Personnel Management Occupational Safety and Health Administration Occupational Safety and Health Review Commission Office of Workers' Compensation Programs Patent Office, or Commissioner of, or Board of Appeals of Pay Board (established under the Economic Stabilization Act of 1970) Pension Benefit Guaranty Corporation U.S. Public Health Service Postal Rate Commission Provider Reimbursement Review Board Renegotiation Board Railroad Adjustment Board Railroad Retirement Board Subversive Activities Control Board Small Business Administration Securities and Exchange Commission Social Security Administration or Commissioner Selective Service System Department or Secretary of the Treasury Tennessee Valley Authority United States Forest Service United States Parole Commission Postal Service and Post Office, or Postmaster General, or Postmaster United States Sentencing Commission Veterans' Administration War Production Board Wage Stabilization Board General Land Office of Commissioners Transportation Security Administration Surface Transportation Board U.S. Shipping Board Emergency Fleet Corp. Reconstruction Finance Corp. Department or Secretary of Homeland Security Unidentifiable International Entity