Mr. Justice Douglas
delivered the opinion of the Court.
Respondent is a union that had a collective-bargaining agreement with an employer which contained a maintenance-of-membership clause providing that members were, as a condition of employment, to remain in good standing “as to payment of dues” for the duration of the contract. Neither the contract nor the Union's constitution or bylaws contained any provision defining or limiting the circumstances under which a member could resign. A few days before the collective agreement expired, the Union membership voted to strike if no agreement was reached by a given date. No agreement was reached in the specified period, so the strike and attendant picketing commenced. Shortly thereafter, the Union held a meeting at which the membership resolved that any member aiding or abetting the employer during the strike would be subject to a $2,000 fine.
About six weeks later, two members sent the Union their letters of resignation. Six months or more later, 29 other members resigned. These 31 employees returned to work.
The Union gave them notice that charges had been made against them and that on given dates the Union would hold trials. None of the 31 employees appeared on the dates prescribed; but the trials nonetheless took place even in the absence of the employees and fines were imposed on all. Suits were filed by the Union to collect the fines. But the outcome was not determined because the employees filed unfair labor practice charges with the National Labor Relations Board against the Union.
The unfair labor practice charged was that the Union restrained or coerced the employees “in the exercise of the rights guaranteed in section 7.” See § 8 (b)(1) of the Act. The Board ruled that the Union had violated § 8 (b)(1). 187 N. L. R. B. 636. The Court of Appeals denied enforcement of the Board’s order. 446 F. 2d 369. The case is here on certiorari, 405 U. S. 987.
We held in NLRB v. Allis-Chalmers Mfg. Co., 388 U. S. 175, that a union did not violate §8 (b)(1) by fining members who went to work during a lawful strike authorized by the membership and by suing to collect the fines. The Court reviewed at length in that opinion the legislative history of §§ 7 and 8(b)(1), and concluded by a close majority vote that the disciplinary measures taken by the union against its members on those facts were within the ambit of the union’s control over its internal affairs. But the sanctions allowed were against those who “enjoyed full union membership.” Id., at 196.
Yet when a member lawfully resigns from the union, its power over him ends. We noted in Scofield v. NLRB, 394 U. S. 423, 429, that if a union rule “invades or frustrates an overriding policy of the labor laws the rule may not be enforced, even by fine or expulsion, without violating §8 (b)(1).” On the facts, we held that Scofield) where fines were imposed on members by the union, fell within the ambit of Allis-Ghalmers. But we drew the line between permissible and impermissible union action against members as follows:
. . §8 (b)(1) leaves a union free to enforce a properly adopted rule which reflects a legitimate union interest, impairs no policy Congress has imbedded in the labor laws, and is reasonably enforced against union members who are free to leave the union and escape the rule.” Id., at 430.
Under § 7 of the Act the employees have “the right to refrain from any or all” concerted activities relating to collective bargaining or mutual aid and protection, as well as the right to join a union and participate in those concerted activities. We have here no problem of construing a union’s constitution or bylaws defining or limiting the circumstances under which a member may resign from the union. We have, therefore, only to apply the law which normally is reflected in our free institutions— the right of the individual to join or to resign from associations, as he sees fit “subject of course to any financial obligations due and owing” the group with which he was associated. Communications Workers v. NLRB, 215 F. 2d 835, 838.
The Scofield case indicates that the power of the union over the member is certainly no greater than the union-member contract. Where a member lawfully resigns from a union and thereafter engages in conduct which the union rule proscribes, the union commits an unfair labor practice when it seeks enforcement of fines for that conduct. That is to say, when there is a lawful dissolution of a union-member relation, the union has no more control over the former member than- it has over the man in the street.
The Court of Appeals gave weight to the fact that the resigning employees had participated in the vote to strike. We give that factor little weight. The first two members resigned from the Union from one to two months after the strike had begun. The others did so from seven tó 12 months after its commencement. And the strike was still in progress 18 months after its inception. Events occurring after the calling of a strike may have unsettling effects, leading a member who voted to strike to change his mind. The likely duration of the strike may increase the specter of hardship to his family; the ease with which the employer replaces the strikers may make the strike seem less provident. We do not now decide to what extent the contractual relationship between union and member may curtail the freedom to resign. But where, as here, there are no restraints on the resignation of members, we conclude that the vitality of § 7 requires that the member be free to refrain in November from the actions he endorsed in May and that his § 7 rights are not lost by a union’s plea for solidarity or by its pressures for conformity and submission to its regime.
Reversed.
Fines equivalent to a day’s wages for each day worked during the strike were imposed.
Section 7 provides in relevant part:
“Employees shall have the right to self-organization, to form, join, or assist labor organizations, to bargain collectively through representatives of their own choosing, and to engage in other concerted activities for the purpose of collective bargaining or other mutual aid or protection, and shall also have the right to refrain from any or all of such activities ....’’ 61 Stat. 140, 29 U. S. C. §157.
Section 8 (b). “It shall be an unfair labor practice for a labor organization or its agents—
“(1) to restrain or coerce (A) employees in the exercise of the rights guaranteed in section 7: Provided, That this paragraph shall not impair the right of a labor organization to prescribe its own rules with respect to the acquisition or retention of membership therein . . . .” 61 Stat. 141, 29 U. S. C. § 158 (b).
Union-security arrangements requiring employees to pay dues, though not requiring membership, have been held not to be an unfair labor practice and therefore not an excuse for the employer to refuse to bargain collectively for such an agreement, at least where state law allows employees that option. NLRB v. General Motors Corp., 373 U. S. 734.
The Union argues that its practice was to accept resignations of members only during an annual ten-day “escape period,” during which time the employees were allowed to revoke their “dues check-off” authorizations. The Court of Appeals rejected that argument, saying there was no evidence that the employees knew of this practice or that they had consented to its limitation on their right to resign. 446 F. 2d 369, 372.
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