550 U.S. 544 (2007) Cited 266,697 times 365 Legal Analyses
Holding that a complaint's allegations should "contain sufficient factual matter, accepted as true, to 'state a claim to relief that is plausible on its face' "
Holding plaintiff-psychiatrists' inability to charge higher fees because they failed an oral examination for board certification did not constitute an antitrust injury
Holding that prison officials' Eighth Amendment duty to take reasonable measures to guarantee the safety of inmates in their custody includes a duty to protect inmates from harm threatened by other officers
349 U.S. 322 (1955) Cited 883 times 2 Legal Analyses
Holding that two suits were not "based on the same cause of action," because "[t]he conduct presently complained of was all subsequent to" the prior judgment and it "cannot be given the effect of extinguishing claims which did not even then exist and which could not possibly have been sued upon in the previous case"
455 U.S. 72 (1982) Cited 354 times 1 Legal Analyses
Holding that, if a contract to contribute to union funds arose from an obligation that was illegal under the antitrust or labor laws, enforcing that contract would command unlawful conduct
Fed. R. Civ. P. 15 Cited 90,557 times 91 Legal Analyses
Finding that, per N.Y. C.P.L.R. § 1024, New York law provides a more forgiving principle for relation back in the context of naming John Doe defendants described with particularity in the complaint
Fed. R. Civ. P. 51 Cited 2,447 times 7 Legal Analyses
Recognizing exception to rule that error may be assigned to failure to give instruction only if party "properly requested it . . . and properly objected"