United States Supreme Court
An antitrust complaint must allege enough facts to state a claim for relief that is plausible on its face, not merely a possibility that the defendant acted unlawfully.
Bell Atlantic Corp. v. Twombly retired the old Conley v. Gibson "no set of facts" pleading standard and replaced it with a plausibility requirement, fundamentally reshaping federal civil pleading practice by requiring that complaints plead factual allegations sufficient to suggest the existence of a claim.