Rule 21: Misjoinder and Nonjoinder of Parties.
Misjoinder of parties is not ground for dismissal of an action. Parties may be dropped or added by order of the court on motion of any party or of its own initiative at any stage of the action and on such terms as are just. Any claim against a party may be severed and proceeded with separately.
Advisory Commission Comments.
Rule 21 allows misjoinder and nonjoinder to be corrected at any stage of the action upon motion of any party or upon the initiative of the court, and removes misjoinder as a ground for dismissal of an action.