In legal procedure (both civil and criminal), misjoinder (also known as wrongful joinder) involves the improper inclusion of one or more parties or causes of action within a lawsuit. The two forms of misjoinder are: Misjoinder of causes of action, or counts: joining several demands to enforce substantive rights of recovery that are distinct and contradictory. Misjoinder of parties: joining as plaintiffs or defendants persons who have conflicting interests, or who were not involved in the same transaction or event.
United States According to FRCP, Rule 21,
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