Mr. Justice Blackmun
delivered the opinion of the Court.
This appeal, heard as a companion to D. H. Overmyer Co. v. Frick Co., ante, p. 174, decided today, also purports to raise for the Court the issue of the due process validity of cognovit provisions. The system under challenge in this case is that of Pennsylvania. The three-judge District Court, with one judge dissenting in part because, in his view, the court did not go far enough, refrained from declaring the Commonwealth’s rules and statutes unconstitutional on their face and granted declaratory and injunctive relief only for a limited class of cognovit signers. 314 F. Supp. 1091 (ED Pa. 1970). The plaintiffs, but not the defendants, appealed. We noted probable jurisdiction the same day certiorari was granted in Overmyer. 401 U. S. 991.
I
The cognovit system is firmly entrenched in Pennsylvania and has long been in effect there.
A confession of judgment for money “may be entered by the prothonotary . . . without the agency of an attorney and without the fifing of a complaint, declaration or confession, for the amount which may appear to be due from the face of the instrument,” Pa. Rule Civ. Proc. 2951 (a), except that the action must be instituted by a complaint if the instrument is more than 10 years old or cannot be produced for filing, “or if it requires the occurrence of a default or condition precedent before judgment may be entered.” Rules 2951 (c) and (d). In an action instituted by a complaint, the plaintiff shall file a confession of judgment substantially in a prescribed form, and the attorney for the plaintiff “may sign the confession as attorney for the defendant” unless a statute or the instrument provides otherwise. Rule 2955. The prothonotary enters judgment “in conformity with the confession.” Rule 2956. The amount due, interest, attorneys' fees, and costs may be included by the plaintiff in the praecipe for a writ of execution. Rule 2957.
Within 20 days after the entry of judgment the plaintiff shall mail the defendant written notice. Failure to do this, however, does not affect the judgment lien. Rule 2958 (a). Within the same 20 days the plaintiff may issue a writ of execution and may do so even if the notice is not yet mailed. Rule 2958 (b). If an affidavit of mailing is not filed within the 20-day period, the writ of execution may not issue until 20 days after the affidavit of mailing has been filed. Rule 2958 (c).
Relief from a judgment by confession may be sought by a petition asserting “[a] 11 grounds for relief whether to strike off the judgment or to open it . . . .” Rule 2959 (a). If the petition states prima facie grounds for relief, the court issues a rule to show cause and may grant a stay. A defendant “waives all defenses and objections” not included in the petition. The court “shall dispose of the rule on petition and answer, and on any testimony, depositions, admissions and other evidence.” Rules 2959 (b), (c), and (e). If the judgment is opened in whole or in part, the issues are then tried. Rule 2960.
The procedure for confession of judgment for possession of real property is essentially the same except that the action shall be commenced by filing a complaint. Rules 2970-2973.
The prothonotary specifically is given power to “enter judgments at the instance of plaintiffs, upon the confessions of defendants.” Pa. Stat. Ann., Tit. 17, § 1482. The prothonotary is the clerk of the court of common pleas. He has no judicial function. It has been said that his power is derived from the instrument under which he acts and not from his office, Smith v. Safeguard Mut. Ins. Co., 212 Pa. Super. 83, 87, 239 A. 2d 824, 826 (1968), and that his entry of judgment is a ministerial act, Lenson v. Sandler, 430 Pa. 193, 197, 241 A. 2d 66, 68 (1968).
It has also been said that the confession of judgment procedure in Pennsylvania exists “independent of statute.” Equipment Corp. of America v. Primos Vanadium Co., 285 Pa. 432, 437, 132 A. 360, 362 (1926); Cook v. Gilbert, 8 Serg. & R. 567, 568 (1822); Hatch v. Stitt, 66 Pa. 264 (1870).
It is apparent, therefore, that in Pennsylvania confession-of-judgment provisions are given full procedural effect; that the plaintiff’s attorney himself may effectuate the entire procedure; that the prothonotary, a nonjudicial officer, is the official utilized; that notice issues after the judgment is entered; and that execution upon the confessed judgment may be taken forthwith. The defendant may seek relief by way of a petition to strike the judgment or to open it, but he must assert prima facie grounds for this relief, and he achieves a trial only if he persuades the court to open. Meanwhile, the judgment and its lien remain.
The pervasive and drastic character of the Pennsylvania system has been noted. Cutler Corp. v. Latshaw, 374 Pa. 1, 4-5, 97 A. 2d 234, 236 (1953). See Kine v. Forman, 404 Pa. 301, 172 A. 2d 164 (1961), and Atlas Credit Corp. v. Ezrine, 25 N. Y. 2d 219, 250 N. E. 2d 474 (1969).
II
Seven individuals are the named plaintiffs in the original complaint filed in December 1969. Jurisdiction is based on the civil rights statutes, 28 U. S. C. § 1343 and 42 U. S. C. § 1983. The plaintiffs purport to act on behalf of a class consisting of all Pennsylvania residents who have signed documents containing cognovit provisions leading, or that could lead, to a confessed judgment in Philadelphia County. The defendants are the county’s prothonotary and sheriff, the officials responsible, respectively, for the recording of confessed judgments and for executing upon them. The complaint alleges that each plaintiff has signed one or another type of consumer financing agreement pursuant to which his creditor has entered judgment; that each faces immediate judicial sale of his home or personal belongings; that the Pennsylvania rules and statutes are unconstitutional on their face because they deprive members of the class of procedural due process in the denial of notice and hearing before judgment; that the signing of the cognovit contract was not an intelligent and voluntary waiver of the right to notice and hearing; that the only recourse against the recorded judgment is an action to strike or reopen; and that such recourse is costly and burdensome to low income consumers, and denies them equal protection. The relief sought is a declaration that the Pennsylvania rules and statutes are unconstitutional, and an injunction against the defendants’ “operating under the above acts and rules.” A three-judge court was requested.
The single District Judge entered a temporary restraining order staying execution of judgments against the seven plaintiffs. He also provided a procedure for adding additional plaintiffs. The three-judge court continued and expanded the restraining order to stay all executions upon confessed judgments in the Commonwealth. A number of additional plaintiffs were added, and one original plaintiff was dismissed from the case. A group of finance companies was permitted to intervene.
Stipulations were made. One was between counsel for the plaintiffs and the city solicitor; another was between counsel for the plaintiffs and for the intervenor finance companies. These stipulations are not identical but they do overlap. They established the following:
1. Judgments by confession against the various plaintiffs had been entered ranging in amounts from $249.23 to $25,800.
2. If called as witnesses, the original plaintiffs would testify to the facts alleged in the complaint. Each would also testify as to his unawareness of the cognovit clause, his lack of understanding of its significance if he had read it, and his inability to bargain about it anyway.
3. If called, some of the plaintiffs would testify that they were encouraged not to read their contracts; that the judgments exceeded the debts because of the addition of penalties, costs, and fees; that they could not afford proceedings to strike or reopen; and that they believed they had meritorious defenses.
4. The imposition and amount of sheriff’s costs, bar association fee schedules, and necessary deposition and transcript costs in the cognovit procedure were acknowledged.
The three-judge court held a hearing. In addition to the appearance of counsel for the plaintiffs and for the intervenors, an assistant city solicitor of Philadelphia appeared for the named defendants, and a Deputy Attorney General appeared for the Commonwealth. The only plaintiff to testify was one of those added after the complaint had been filed. She was a postal clerk who earned $6,100 annually and who had agreed with a door-to-door salesman to buy a carpet for $1,300. Her contract contained a cognovit clause pursuant to which a finance company had obtained a confessed judgment. A detective and a finance company officer were presented by the plaintiffs. They testified to the pervasiveness of cognovit clauses and the “disbelief and shock” of those who had signed them.
The plaintiffs also introduced in evidence by stipulation a published report by David Caplovitz, Ph. D., Consumers in Trouble. This was a 1968 study of confessed-judgment debtors in four major Pennsylvania cities. It included 245 Philadelphia debtors. The study purported to show that 96%' had annual incomes of less than $10,000, and 56% less than $6,000; that only 30%' had graduated from high school; and that only 14% knew the contracts they signed contained cognovit clauses.
The only other witness at the hearing was one called by the intervenors. He was a finance company officer and testified as to the usual practice of making loans.
The three-judge District Court held:
1. The Pennsylvania-system leading to confessed judgment and execution does comply with due process standards provided “there has been an understanding and voluntary consent of the debtor in signing the document.” 314 F. Supp., at 1095.
2. If, however, there is no such understanding consent, the procedure violates due process requirements of notice and an opportunity to be heard. Ibid.
3. The plaintiffs did not sustain their burden of proof with respect to the lack of valid consent in the execution of bonds and warrants of attorney accompanying mortgages. Id., at 1098.
4. The record did not establish that the action could be maintained as a class action on behalf of individual natural persons with annual incomes of more than $10,000. Id., at 1098-1099.
5. It could be maintained, however, as a class action on behalf of natural persons residing in Pennsylvania who earn less than $10,000 annually and who signed consumer financing or lease contracts containing cognovit provisions. Id., at 1099.
6. There was no intentional waiver of known rights by members of that class in executing confession-of-judgment clauses. These were the right to have prejudgment notice and hearing, the right to have the burden of proof on the creditor, and the right to avoid the expenses attendant upon opening or striking a confessed judgment. Since the Pennsylvania procedure with respect to the designated class was based upon a waiver concept without adequate understanding, it was violative of due process. Id., at 1100.
7. It was not the federal court’s function to dictate to Pennsylvania “exactly what constitutes understanding waiver.” Ibid. Where the debtor is an attorney, an affidavit to that effect may be all that is necessary to prove understanding, but where the debtor is not a high school graduate more proof “may be required.” Id., at 1101. A “statewide rule or legislation providing for the filing of proof of intentional, understanding and voluntary consent,” in order to comply with the court’s opinion, was among the methods available to the State to permit continued use of the confession-of-judgment clause. Id., at 1100-1101, n. 24.
8. No judgment by confession may be entered as to a member of the recognized class after November 1, 1970, unless it is shown that at the time of executing the document the debtor “intentionally, understandingly, and voluntarily waived” his rights lost under the Pennsylvania law. Id., at 1102-1103.
9. Liens of judgments recorded prior to June 1, 1970 (the date of the filing of the court's opinion), were preserved. A confessed judgment on a contract signed before June 1 could be entered between that date and November 1, but could not be executed upon without a prior hearing to determine the validity of the waiver.
The court then declared the Pennsylvania practice of confessing judgments to be unconstitutional, prospectively effective as of the dates stated, as applied to the class designated, and enjoined the entry of any confessed judgment against a member of the class in the absence of a showing of the required waiver. Id., at 1103. The judge dissenting did so as to the limitation of relief to those earning less than $10,000 annually. Id., at 1102.
Ill
From this judgment only the plaintiffs appeal. Their claim is that the District Court erred in confining the relief it granted to certain members of the appellants’ proffered class and that the court should have declared the Pennsylvania rules and statutes unconstitutional on their face. A holding of facial unconstitutionality, of course, wholly apart from any class consideration, would afford relief to every Pennsylvania cognovit obligor. Today's decision in Overmyer, although it concerns a corporate and not an individual debtor, is adverse to this contention of the plaintiff-appellants. In Overmyer it is recognized, as the District Court in this case recognized, that, under appropriate circumstances, a cognovit debtor may be held effectively and legally to have waived those rights he would possess if the document he signed had contained no cognovit provision.
On the plaintiff-appellants’ appeal, therefore, the judgment of the District Court must be affirmed.
This affirmance, however, does not mean that the District Court’s opinion and judgment are approved as to their other aspects and details that are not before us. As has been noted, the named defendants and the inter-venors have taken no cross appeal. Furthermore, the Pennsylvania Attorney General’s office, apparently due to an interim personnel change, no longer supports the position taken at the trial by the city solicitor and the deputy attorney general and, not choosing to pursue its customarily assumed duty to defend the Commonwealth’s legislation, now joins the appellants in urging here that the rules and statutes are facially invalid. With the Attorney General taking this position, argument on the side of the defendant-appellees has been presented to us only by the intervenor finance companies and by amici. The permissible reach of this opposition, however, coincides with and goes no further than the extent of the appellants’ appeal. In the absence of a cross appeal, the opposition is in no position to attack those portions of the District Court’s judgment that are favorable to the plaintiff-appellants.
IV
The decision in Overmyer and the disposition of the present appeal prompt the following observations:
1. In our second concluding comment in Overmyer, supra, at 188, we state that the decision is “not controlling precedent for other facts of other cases,” and we refer to contracts of adhesion, to bargaining power disparity, and to the absence of anything received in return for a cognovit provision. When factors of this kind are present, we indicate, “other legal consequences may ensue.” That caveat has possible pertinency for participants in the Pennsylvania system.
2. Overmyer necessarily reveals some discomfiture on our part with respect to the present case. However that may be, the impact and effect of Overmyer upon the Pennsylvania system are not to be delineated in the one-sided appeal in this case and we make no attempt to do so.
3. Problems of this kind are peculiarly appropriate grist for the legislative mill.
On the appellants' appeal, the judgment of the District Court is affirmed. The stay heretofore granted by the Circuit Justice is dissolved.
Is is so ordered.
Mr. Justice Powell and Mr. Justice Rehnquist took no part in the consideration or decision of this case.
Pa. Rules Civ. Proc. 2950-2976, effective Jan. 1, 1970 (which, by the Act of June 21, 1937, Pa. Laws 1982, have the effect of state statutes); Act of Apr. 14, 1834, Pa. Stat. Ann., Tit. 17, § 1482 III; Act of Feb. 24, 1806, Pa. Stat. Ann., Tit. 12, § 739; Act of Mar. 21, 1806, Pa. Stat. Ann., Tit. 12, § 738. By Rule 2976, Pa. Stat. Ann., Tit. 12, § 739 is suspended “only insofar as it may be inconsistent with these rules,” and Pa. Stat. Ann., Tit. 12, § 738 is suspended in its application to actions to confess judgment for money or for possession of real .property.
Prior to the effective date of Rules 2950-2976, Pa. Stat. Ann., Tit. 12, § 738 provided that it “shall be the duty” of the prothonotary to enter an application and “on confession in writing ... he shall enter judgment . . . .”
Compare the result reached with respect to the Delaware system in Osmond v. Spence, 327 F. Supp. 1349 (Del. 1971).