proach to class actions, see Moore v. Metropolitan Life Insurance Co., 33 N.Y.2d 304, 313, 352 N.Y.S.2d 433, 439, 307 N.E.2d 554 (1973), we would hesitate to hold, simply on the basis of the cases’ captions, that they in fact were properly conducted as class actions and that their judgments purported to bind the -class. Moreover, even if we were assured that the first Green wald case was a class action, we would not want to hold McCune barred without knowing why Schmidt’s state court action was decided on the merits rather than on res judicata grounds. It may well be that res judica-ta, which must be pleaded affirmatively,14 simply was not raised as a defense. But without the record in the Schmidt case we do not know whether that in fact was what happened or whether perhaps the defense was raised and rejected.
Because our inability to determine whether New York would hold McCune bound by the prior decisions is the result of an inadequate record, we vacate the district court’s judgment and remand the case so that the parties can develop the record. If, upon being provided with the necessary materials, the district court concludes that New York would hold McCune bound, it should dismiss the action on res judicata grounds. If, on the other hand, it determines that New York would let him proceed, it should do likewise.
II. CONSIDERATIONS ON REMAND
Even if the district court decides that McCune is not barred by res judicata, it should not reinstate its judgment without considering several preliminary issues.
The first such issue is whether the pendency of disciplinary hearings against McCune bars his action under the principles of Younger v. Harris, 401 U.S. 37, 91 S.Ct. 746, 27 L.Ed.2d 669 (1971).15 There the Court held that considerations of comity preclude federal courts from enjoining pending state criminal proceedings in the absence of extraordinary circumstances. A companion case to Younger, Samuels v. Mackell, 401 U.S. 66, 91 S.Ct. 764, 27 L.Ed.2d 688 (1971), held that the same result obtains when a federal court is asked to issue a declaratory judgment on the constitutionality of a state statute pursuant to which a prosecution is pending. Subsequent decisions have indicated that Younger is not limited to criminal proceedings. Schlesinger v. Councilman, 420 U.S. 738, 95 S.Ct. 1300, 43 L.Ed.2d 591 (1975) (military court-martial); Huffman v. Pursue, Ltd., 420 U.S. 592, 95 S.Ct. 1200, 43 L.Ed.2d 482 (1975) (state court nuisance action seeking to shut down theater showing allegedly obscene films); Anonymous v. Association of the Bar of the City of New York, 515 F.2d 427 (2d Cir. 1975) (bar association disciplinary proceedings). The holding in Schlesinger rested largely on the unique role of the military in our society, 420 U.S. 592 at 757-758, 95 S.Ct. 1300 at 1313, 43 L.Ed.2d 591; since we have rejected the notion that discipline in the police force is to be given the same judicial deference as military discipline, Dwen v. Barry, supra, 483 F.2d 1126 at 1128-29, that decision is not necessarily controlling here. Huffman, on the other hand, was premised on the determination that the state court action, though nominally civil, was in some respects more like a criminal action: the state was party and the action
14
Bronxville Palmer, Ltd. v. State, 18 N.Y.2d 560, 277 N.Y.S.2d 402, 223 N.E.2d 887 (1966); Krekeler v. Ritter, 62 N.Y. 372 (1875); Halladay v. Kolner, 276 App.Div. 943, 94 N.Y.S.2d 886 (1950).
15
Younger is apparently not a defense that must be pleaded affirmatively. When the Supreme Court noted probable jurisdiction in Sosna v. Iowa, 415 U.S. 911, 94 S.Ct. 1405, 39 L.Ed.2d 465 (1974), it directed the parties to brief the Younger issue although it evidently had not been raised below. On the other hand, Younger is not jurisdictional, since in Sosna the Court permitted the state to waive it, 419 U.S. 393, 396-97 n. 3, 95 S.Ct. 553, 42 L.Ed.2d 532 (1975), and jurisdiction of course is not waivable. See Huffman v. Pursue, Ltd., 420 U.S. 592, 613 n. 1, 95 S.Ct. 1200, 1212 n. 1 (dissenting opinion of Brennan, J.)