International Ass'n of Machinists & Aerospace Workers, District Lodge No. 94, Local Lodge No. 1484 v. International Longshoremen's & Warehousemen's Union, Local 13

The International Association of Machinists and Aerospace Workers, District Lodge # 94, Local Lodge # 1484 (“IAM”) brought this action against the International Longshoremen’s and Warehousemen’s Union, *686 Local # 13 (“LOCAL 13”), alleging that LOCAL 13 was in breach of a jurisdictional agreement between the two locals. The district court agreed with IAM and issued a permanent injunction prohibiting both parties and “all persons acting in concert with any of them” from violating any term of the jurisdictional agreement. Shortly after the trial, the Pacific Maritime Association (“PMA”), the International Longshoremen’s and Warehousemen’s Union (“ILWU”), California United Terminals (“CUT”), and Long Beach Container Terminal, Inc. (“LBCT”) moved to intervene, but the district court denied their request.

LOCAL 13 now appeals the grant of injunctive relief and is joined by PMA, ILWU, CUT and LBCT in appealing the denial of intervention. We reverse and remand.

BACKGROUND

This dispute arises out of the fact that IAM and LOCAL 13 are affiliates of different international unions and represent different workers in the Los Angeles-Long Beach port area. Historically, longshoremen…