Mr. Justice Stewart
delivered the opinion of the Court.
The federal anti-injunction statute provides that a federal .court “may not grant an injunction to stay proceedings in a State court except as expressly authorized by Act of Congress, or where necessary in aid of. its jurisdiction,, or to protect or effectuate its judgments.” 1 An Act of Congress, 42 U. S. C. § 1983, expressly authorizes a “suit in equity” to redress “the deprivation,” under color of state law, “of any rights, privileges, or immunities secured by the Constitution . ...”2 The question before us is whether this “Act of Congress” comes within the “expressly authorized” exception of the anti-injunction statute so as to permit a federal court in a § 1983 suit to grant an injunction to stay a proceeding pending in. a state court. This question, which has divided the federal courts,3 has lurked in the background of many of our recent cases, but we have not until today explicitly decided it.4
[227]*227I
The prosecuting attorney of Bay County, Florida, brought a proceeding in a Florida court to close down the appellant's’ bookstore as a public nuisance under the claimed authority of Florida law. The state court entered a preliminary order prohibiting continued operation of the bookstore. After further inconclusive proceedings in the state courts, the appellant filed a complaint in the United States District Court for the Northern District of Florida, alleging that „ the actions of the state judicial and law enforcement officials were depriving him of rights protected by the First and Fourteenth Amendments. Relying upon 42 U. S. C. .§ 1983,5 he asked for injunctive and declaratory relief against the state court proceedings, on the. ground that Florida laws were being unconstitutionally applied by the state court so as to cause him great and irreparable harm; A single federal district judge issued temporary restraining orders, and ,a three-judge court was convened pursuant to 28 U. S. C. §§ 2281 and 2284. After a hearing, .the three-judge court dissolved the temporary restraining orders and refused to. enjoin the state court proceeding, holding that the “injunctive relief sought here [228]*228as to the proceedings pending in the Florida courts does not come, under any of the exceptions set forth in Section 2283. It is not expressly authorized by Act of Congress,, it is not necessary in the aid of this court’s jurisdiction, and it is not sought in order to protect or effectuate any judgment of this court.” 315 F. Supp. 1387, 1389. An appeal was brought directly here under 28 U. S. C. § 1253,6 and we noted probable jurisdiction. 402 U. S. 941.
II
In denying injunctive relief, the District Court relied on this Court’s decision in Atlantic Coast, Line R. Co. v. Brotherhood, of Locomotive Engineers, 398 U. S. 281. The Atlantic Coast Line case did not deal with the “expressly authorized” exception of the anti-injunction statute,7 but the Court’s opinion in that ease does bring into sharp focus the critical importance of the question now before us. For in that case we expressly rejected the view that the anti-injunction statute merely states a flexible doctrine of comity,8 and made clear that the statute imposes an absolute ban upon the issuance of a federal injunction against a pending [229]*229state court proceeding, in the absence of one of the recognized exceptions:
“On its face the present Act is an absolute, prohibition against enjoining state court proceedings, unless the injunction falls within one of three specifically defined exceptions. The respondents here have intimated that the Act only establishes a ‘principle of comity,’ not a binding rule on the power of the federal courts. The argument implies that in certain circumstances a federal court may enjoin state court proceedings even if that action cannot be justified by any of the three exceptions. We cannot accept any such contention. . . . [We] hold that any injunction against state court proceedings otherwise proper under general equitable principles must be based on one of the specific statutory exceptions to § 2283 if it is to be. upheld. . . .” 398 U. S., at 286-287.
It follows, in the present context, that'if 42 U. S. C. § 1983 is not within the. “expressly authorized” exception of the anti-injunction statute, then a federal equity court is wholly without power to grant any relief in a § 1983 suit seeking to stay a state court proceeding. In short, if a § 1983 action is not an “expressly authorized” statutory exception, the anti-injunction law absolutely prohibits in such an action all federal equitable intervention in a pending state court proceeding, whether civil or criminal, and regardless of how extraordinary the particular circumstances may be.
Last Term, in Younger v. Harris, 401 U. S. 37, and its companion cases,9 the Court dealt at length with the subject of federal judicial intervention in pending [230]*230state criminal prosecutions. In Younger a three-judge federal district court in a § 1983 action had enjoined a criminal prosecution pending in. a California court. In. asking us to reverse that judgment, the appellant argued that the injunction .was in violation of the federal anti-injunction statute. 401 U. S., at 40. But the Court carefully eschewed any reliance on the statute in reversing the judgment, basing its decision. instead upon what the Court called “Our Federalism” — upon “the national policy forbidding fedéral courts to stay or enjoin pending state court proceedings except under special circumstances.” 401 U. S., at 41, 44.
In Younger, this Court emphatically reaffirmed “the fundamental policy against federal .interference with, state criminal prosecutions.” 401 U. S., at 46. It made clear that even “the' possible' unconstitutionality of a statute ‘on its face’ does not in itself justify an injunction against good-faith attempts to enforce it.” 401 U. S., at 54. At the same time, however, the Court clearly left room for federal injunctive intervention in a pending state court prosecution in certain exceptional circumstances — where irreparable injury is “both great and immediate,” 401 U. S., at 46, where the state law is “ ‘flagrantly and patently violative of express constitutional prohibitions,’ ” 401 U. S., at 53, or where there is a showing of “bad faith, harassment, or .'. . other unusual circumstances that would call for equitable relief.” 401 U. S., at, 54. In the companion case of Perez v. Ledesma, 401 U. S. 82, the Court said that “[o]nly in cases of proven harassment or prosecutions undertaken by state officials in bad faith without hope of obtaining a valid conviction and perhaps in other extraordinary circumstances where irreparable injury can be shown is federal injunctive relief against pending [231]
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Mr. Justice Stewart
delivered the opinion of the Court.
The federal anti-injunction statute provides that a federal .court “may not grant an injunction to stay proceedings in a State court except as expressly authorized by Act of Congress, or where necessary in aid of. its jurisdiction,, or to protect or effectuate its judgments.” 1 An Act of Congress, 42 U. S. C. § 1983, expressly authorizes a “suit in equity” to redress “the deprivation,” under color of state law, “of any rights, privileges, or immunities secured by the Constitution . ...”2 The question before us is whether this “Act of Congress” comes within the “expressly authorized” exception of the anti-injunction statute so as to permit a federal court in a § 1983 suit to grant an injunction to stay a proceeding pending in. a state court. This question, which has divided the federal courts,3 has lurked in the background of many of our recent cases, but we have not until today explicitly decided it.4
[227]*227I
The prosecuting attorney of Bay County, Florida, brought a proceeding in a Florida court to close down the appellant's’ bookstore as a public nuisance under the claimed authority of Florida law. The state court entered a preliminary order prohibiting continued operation of the bookstore. After further inconclusive proceedings in the state courts, the appellant filed a complaint in the United States District Court for the Northern District of Florida, alleging that „ the actions of the state judicial and law enforcement officials were depriving him of rights protected by the First and Fourteenth Amendments. Relying upon 42 U. S. C. .§ 1983,5 he asked for injunctive and declaratory relief against the state court proceedings, on the. ground that Florida laws were being unconstitutionally applied by the state court so as to cause him great and irreparable harm; A single federal district judge issued temporary restraining orders, and ,a three-judge court was convened pursuant to 28 U. S. C. §§ 2281 and 2284. After a hearing, .the three-judge court dissolved the temporary restraining orders and refused to. enjoin the state court proceeding, holding that the “injunctive relief sought here [228]*228as to the proceedings pending in the Florida courts does not come, under any of the exceptions set forth in Section 2283. It is not expressly authorized by Act of Congress,, it is not necessary in the aid of this court’s jurisdiction, and it is not sought in order to protect or effectuate any judgment of this court.” 315 F. Supp. 1387, 1389. An appeal was brought directly here under 28 U. S. C. § 1253,6 and we noted probable jurisdiction. 402 U. S. 941.
II
In denying injunctive relief, the District Court relied on this Court’s decision in Atlantic Coast, Line R. Co. v. Brotherhood, of Locomotive Engineers, 398 U. S. 281. The Atlantic Coast Line case did not deal with the “expressly authorized” exception of the anti-injunction statute,7 but the Court’s opinion in that ease does bring into sharp focus the critical importance of the question now before us. For in that case we expressly rejected the view that the anti-injunction statute merely states a flexible doctrine of comity,8 and made clear that the statute imposes an absolute ban upon the issuance of a federal injunction against a pending [229]*229state court proceeding, in the absence of one of the recognized exceptions:
“On its face the present Act is an absolute, prohibition against enjoining state court proceedings, unless the injunction falls within one of three specifically defined exceptions. The respondents here have intimated that the Act only establishes a ‘principle of comity,’ not a binding rule on the power of the federal courts. The argument implies that in certain circumstances a federal court may enjoin state court proceedings even if that action cannot be justified by any of the three exceptions. We cannot accept any such contention. . . . [We] hold that any injunction against state court proceedings otherwise proper under general equitable principles must be based on one of the specific statutory exceptions to § 2283 if it is to be. upheld. . . .” 398 U. S., at 286-287.
It follows, in the present context, that'if 42 U. S. C. § 1983 is not within the. “expressly authorized” exception of the anti-injunction statute, then a federal equity court is wholly without power to grant any relief in a § 1983 suit seeking to stay a state court proceeding. In short, if a § 1983 action is not an “expressly authorized” statutory exception, the anti-injunction law absolutely prohibits in such an action all federal equitable intervention in a pending state court proceeding, whether civil or criminal, and regardless of how extraordinary the particular circumstances may be.
Last Term, in Younger v. Harris, 401 U. S. 37, and its companion cases,9 the Court dealt at length with the subject of federal judicial intervention in pending [230]*230state criminal prosecutions. In Younger a three-judge federal district court in a § 1983 action had enjoined a criminal prosecution pending in. a California court. In. asking us to reverse that judgment, the appellant argued that the injunction .was in violation of the federal anti-injunction statute. 401 U. S., at 40. But the Court carefully eschewed any reliance on the statute in reversing the judgment, basing its decision. instead upon what the Court called “Our Federalism” — upon “the national policy forbidding fedéral courts to stay or enjoin pending state court proceedings except under special circumstances.” 401 U. S., at 41, 44.
In Younger, this Court emphatically reaffirmed “the fundamental policy against federal .interference with, state criminal prosecutions.” 401 U. S., at 46. It made clear that even “the' possible' unconstitutionality of a statute ‘on its face’ does not in itself justify an injunction against good-faith attempts to enforce it.” 401 U. S., at 54. At the same time, however, the Court clearly left room for federal injunctive intervention in a pending state court prosecution in certain exceptional circumstances — where irreparable injury is “both great and immediate,” 401 U. S., at 46, where the state law is “ ‘flagrantly and patently violative of express constitutional prohibitions,’ ” 401 U. S., at 53, or where there is a showing of “bad faith, harassment, or .'. . other unusual circumstances that would call for equitable relief.” 401 U. S., at, 54. In the companion case of Perez v. Ledesma, 401 U. S. 82, the Court said that “[o]nly in cases of proven harassment or prosecutions undertaken by state officials in bad faith without hope of obtaining a valid conviction and perhaps in other extraordinary circumstances where irreparable injury can be shown is federal injunctive relief against pending [231]*231state prosecutions appropriate.” 401 U. S., at 85. See also Dyson v. Stein, 401 U. S. 200, 203.
While the Court in Younger and its companion cases expressly disavowed deciding the question now before us — whether § 1983 comes within the “expressly authorized” exception of the anti-injunction statute, 401 U. S., at 54 — it is evident that our decisions in those cases cannot be disregarded in deciding this question. In the first place, if § 1983 is not within the statutory exception,' then the anti-injunction statute would have absolutely barred the injunction issued in Younger, as the appellant in that case argued, and there would have been no occasion whatever for the Court to decide that, case upon the “policy” ground of “Our Federalism.” Secondly, if § 1983 is not within the “expressly authorized” exception of the anti-injunction statute, then we must overrule Younger and its companion cases insofar as they recognized the permissibility of injunctive relief against pending criminal prosecutions in certain limited and exceptional circumstances. For, under the doctrine of Atlantic Coast Line, the anti-injunction statute would, in a § 1983 case, then be an “absolute prohibition” against federal equity intervention in a pending state criminal or civil proceeding — under any circumstances whatever.
The Atlantic Coast Line and Younger cases thus serve to delineate both the importance and the finality of the question now before us. And it is in the shadow of those cases that the question must be decided.
III
The anti-injunction statute goes back almost to the beginnings of our history as a Nation. In 1793, Congress enacted a law providing that no “writ of injunction be granted [by any federal court] to stay proceedings [232]*232in any 'court of a state. . . Act of March' 2, 1793; 1 Stat. 335. The precise origins of • the legislation are shrouded in obscurity,10 .but the consistent understand[233]*233ing has been that its basic purpose is to prevent “needless friction between state and federal courts.” Oklahoma Packing Co. v. Gas Co., 309 U. S. 4, 9. The law remained unchanged until 1874, when it was amended to permit a federal court to stay state court proceedings that interfered with the administration of a federal bankruptcy proceeding.11 The present wording of the legislation was adopted with the enactment of Title 28 of the United States Code in 1948.
Despite the seemingly uncompromising language of the anti-injunction statute prior to 1948, the Court soon [234]*234recognized that exceptions must be made to its blanket prohibition if the import and purpose of other Acts of Congress were to be given their intended scope: . So it was that, in addition to the bankruptcy law exception that Congress explicitly, recognized in 1874, the Court through the years found that federal courts were empowered. to enjoin state court proceedings, despite the anti-injunction.statute,.in carrying.out-.the will.of Congress under at least six. other .federal'-laws.: -These" covered a broad speetrum of congressional-' action: ,(l) legislation providing for removal .of litigation from state to federal courts,12 (2) legislation limiting the liability of shipowners,13 (3) legislation providing for federal interpleader actions,14 (4) legislation conferring federal jurisdiction over farm mortgages, 15 (5) legisla[235]*235tion governing federal habeas corpus proceedings,16 and (6) legislation providing for control of prices.17
In addition to the exceptions to the anti-injunction statute found to be embodied in these various Acts of Congress- the Court recognized other “implied” exceptions to thé blanket prohibition of' the anti-injunction statute. One was an “in rem” exception, allowing a federal court to enjoin a state court proceeding in order to protect its jurisdiction of a res over which it had first acquired jurisdiction.18 Another was a “relitiga-tioh” exception, permitting a federal court to enjoin relitigation in a state court of issues already decided in federal litigation.19 Still a third exception, more recently developed, permits a federal injunction of state [236]*236court proceedings when the plaintiff in the federal court is the United States itself, or a federal agency asserting “superior federal interests.” 20
In Toucey v. New York Life Ins. Co., 314 U. S. 118, the Court in 1941 issued an opinion casting considerable doubt upon the approach to the anti-injunction statute reflected in its previous decisions. The Court’s opinion expressly disavowed the “relitigation” exception to the statute, • and emphasized generally the importance of recognizing the statute’s basic directive “of ‘hands off’ by the federal courts in.the use of the injunction..to stay litigation in a state court.” 314 U. S., at 132. The congressional response to Toucey was the enactment in 1948 of the anti-injunction statute in its present form in 28 U. S. C. § 2283, which, as the Reviser’s Note makes evident, served not only to overrule the specific holding of Toucey,21 but to restore “the basic law as generally understood and interpreted prior to the Toucey decision.” 22
. We proceed, then, upon the understanding that in determining whether § 1983 comes within the “expressly authorized” exception of the anti-injunction statute, the [237]*237criteria to be applied are those reflected in the Court’s decisions prior to Toucey,23 A review of those decisions makes reasonably clear what the relevant criteria are. In the first place, it is evident that, in order to qualify under the “expressly authorized” exception of the anti-injunction statute, a federal law need not contain an express reference to that statute. As the Court has said, “no prescribed formula is required; an authorization need- not expressly refer to § 2283.” Amalgamated Clothing Workers v. Richman Bros. Co., 348 U. S. 511, 516. Indeed, none of the previously recognized' statutory exceptions contains any such reférence.24 Secondly, a federal law need not expressly authorize an injunction of a state .court proceeding in order to qualify as an exception. Three of the six previously recognized statutory exceptions contain no such authorization.25 Thirdly, it is clear that, in order to qualify as an “expressly authorized” exception to the anti-injunction statute, an Act of Congress must have created a specific and uniquely federal right or remedy, enforceable in a federal court of equity, that could be frustrated if the federal court were not empowered to enjoin a state court proceeding." This is not [238]*238to say that in order to come within the exception an Act of Congress must, on its face and in every one of its provisions, be totally incompatible with the prohibition of the anti-injunction statute.26 The test, rather, is whether an Act of Congress, clearly creating a federal right or remedy enforceable in a federal court of equity, could be given its intended scope only, by the stay of a state court proceeding. See Toucey, supra, at 132-134; Kline v. Burke Construction Co., 260 U. S. 226; Providence & N. Y. S. S. Co. V. Hill Mfg. Co., 109 U. S. 578, 599; Treinies v. Sunshine Mining Co., 308 U. S. 66, 78; Kalb v. Feuerstein, 308 U. S. 433; Bowles v. Willingham, 321 U. S. 503.
With these criteria in view, we turn to consideration of 42 U. S. C. § 1983.
W
Section 1983 was originally § 1 of the Civil Rights Act of 1871. 17 Stat. 13. It was .“modeled" on § 2 of the Civil Rights Act of 186.6, Í4 Stat. 27;27 and was enacted for the express purpose of “enforcing] the Provisions of the Fourteenth Amendment.” 17 Stat. 13. The predecessor of § 1983 was thus an important part of the basic alteration in our federal system wrought in the Reconstruction era through federal legislation and constitutional amendment.28 As a résult of the [239]*239new . structure of law that emerged in the post-Civil War era — and especially of the Fourteenth. Amendment, which was its centerpiece — ‘the role of the Federal Government' as a guarantor of basic federal rights against state power was clearly established. Monroe v. Pape, 365 U. S. 167; McNeese v. Board of Education, 373 U. S. 668; Shelley v. Kraemer, 334 U. S. 1; Zwickler v. Koota, 389 U. S. 241, 245-249; H. Flack, The Adoption of the Fourteenth Amendment (1908); J. tenBroek, The Anti-Slavery Origins of the Fourteenth Amendment (1951).29 Section 1983 opened the federal courts to private citizens, offering a uniquely federal remedy against incursions under the claimed authority of state law upon rights secured by the Constitution and Jaws of the .Nation.30
[240]*240It is clear from the legislative debates surrounding passage of § 1983’s predecessor that the Act was intended to enforce the provisions of the Fourteenth Amendment “against State action,... whether that action be executive, legislative, or judicial.” Ex parte Virginia, 100 U. S. 339, 346 (emphasis supplied). Proponents of the legislation noted that state courts were being used to harass and injure individuals, either because the state courts were powerless to stop deprivations or were in league with those who were bent upon abrogation of federally protected rights.
As Representative Lowe stated, the “records of * the [state] tribunals are searched in vain for evidence of effective redress [of federally secured rights] .... What less than this [the Civil Rights Act of 1871] will afford an adequate remedy? The Federal Government cannot serve a writ of mandamus 'upon State Executives or upon State courts- to compel them to protect the rights, privileges and immunities of citizens .... The case has arisen . . . when the Federal Government must, resort to its own agencies to carry its own authority into execution. Hence this bill throws open the doors of the United States courts to'those whose rights under the Constitution are denied or impaired.” Cong. Globe, 42d Cong., 1st Sess., 374^376 (1871), This view was echoed by Senator Osborn: “If the State courts had proven themselves competent to suppress the local dis[241]*241orders, or to maintain law and order, we should not have been called upon to legislate . . , . We are driven by existing facts to provide for the several states in the South what they have been unable to fully provide for themselves; i. e., the full and complete administration of justice in the courts. And the courts with reference to which we legislate must be the United States courts.” Id., at 653. And Representative Perry concluded: “Sheriffs, having eyes to see, see not; judges, having ears to hear, hear not; witnesses conceal the' truth or falsify it; grand and petit juries act as if they might be accomplices .... [A] 11 the apparatus and machinery of civil government, all the processes of justice, skulk away as if government and justice were crimes and feared detection. Among the most dangerous things an injured party can do is to appeal .to- justice.” Id., at App. 78.31
' Those who opposed the Act of 1871 clearly recognized that the proponents, were extending federal power in an attempt to- remedy the state courts’ failure to secure federal rights. The debate was not about whether the predecessor of § 1983 extended to actions of state [242]*242courts, but whether this innovation was necessary or desirable.32
This legislative history makes evident that Congress clearly conceived that it was altering the relationship between the States and the Nation with respect to the protection of federally created rights; it was concerned that state instrumentalities could not protect those rights; it realized that state officers might, in fact, be antipathetic to the vindication of those rights; and it believed that these failings extended to the state courts.-
V
Section 1983 was thus a product of a vast transformation from the concepts of federalism. that had prevailed in the late 18th century when the anti-injunction. statute was enacted. The very purpose of § 1983 was to interpose the federal courts between the States and the people, as guardians of the people’s federal rights — to protect the people from unconstitutional action under color of state law, “whether that action be executive, legislative, or judicial.” Ex parte Virginia, 100 U. S., at 346. In carrying out that purpose, Congress plainly authorized the federal courts to issue injunctions in § 1983 actions, by expressly authorizing a “suit in equity” as one of the means of redress. And this Court long ago recognized that, federal injunctive relief against a state court proceeding can in some circumstances, be essential to prevent great, immediate, and irreparable loss of a person’s constitutional rights. Ex parte Young, 209 U. S. 123;. cf. Truax v. Raich, 239 U. S. 33; Dombrowski v. Pfister, 380 U. S. 479. For these reasons we conclude that, under the [243]*243criteria established in our previous decisions construing the anti-injunction statute, § 1983 is an Act of Congress that falls within the “expressly authorized” exception of that law.
In so concluding, we do not question or qualify in any way the principles of equity, comity, and federalism that must restrain a federal court when asked to enjoin a state court proceeding. These principles, in the context of state criminal prosecutions, were canvassed at length last Term in Younger v. Harris, 401 U. S. 37, and its companion cases. They are principles that have been emphasized by this Court many times in the past. Fenner v. Boykin, 271 U. S. 240; Spielman Motor Sales Co. v. Dodge, 295 U. S. .89; Beal v. Missouri Pac. R. Co., 312 U. S. 45; Watson v. Buck, 313 U. S. 387; Williams v. Miller, 317 U. S. 599; Douglas v. City of Jeannette, 319 U. S. 157; Stefanelli v. Minard, 342 U. S. 117; Cameron v. Johnson, 390 U. S. 611. Today we decide only that the District Court in this case was in error in holding that, because .of the anti-injunction statute, it was absolutely without power in this' § 1983 action to enjoin»a .proceeding pending in a state court under any circumstances whatsoever.
■ The judgment is reversed and the case is remanded to the District Court for further proceedings consistent with this opinion.
It is so ordered.
Mr. Justice Powell and Mr. Justice Rehnquist took no part in the consideration or decision of this case.