Federal Practice Manual for Legal Aid Attorneys: 6.3.11 Rule 19 Motion for Joinder of Parties
Federal Rule of Civil Procedure 19 governs the mandatory joinder of parties.2804 Advocates who engage in affirmative litigation against corporate entities—e.g., employers of low-wage workers, debt collectors, large apartment complexes, or predatory lenders—may learn in discovery that they must join additional defendants (often related corporate entities) to obtain full relief or because any relief ordered in the action would necessarily affect those other business entities.