What are the requirements for certifying a plaintiff class against a defendant class?

MultiRegion, United States of America

The following excerpt is from Consolidated Rail Corp. v. Town of Hyde Park, 47 F.3d 473 (2nd Cir. 1995):

Although plaintiff classes are certified more frequently, we have held that the above requirements apply equally to plaintiff and defendant classes. See Marcera v. Chinlund, 595 F.2d 1231, 1237 (2d Cir.1979), vacated on other grounds, 442 U.S. 915, 99 S.Ct. 2833, 61 L.Ed.2d 281 (1979).

1. Numerosity.

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