Federal Rules of Civil Procedure
Title IV – Parties

Rule 23 governs the procedure for class action litigation. In a class action, a single plaintiff or small group of plaintiffs seeks to proceed on behalf of an entire class who have been harmed by the same conduct by the same defendants; actions against classes of defendants are also theoretically permitted. Court approval is required for this procedure to be used. Rule 23.1 governs derivative suits in which a plaintiff seeks to assert a right belonging to a corporation (or similar entity) in which the plaintiff is a shareholder, on behalf of the corporation that is not pursuing the claim itself. Rule 23.2 governs actions by or against unincorporated associations.
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