A summary of Southern California-related business litigation developments during the past week.

Producers Sue Actors Guild: The Alliance of Motion Picture Producers filed suit against the Screen Actors Guild in U.S. District Court, accusing the union of violating a labor agreement by seeking to represent the actors who work as extras in films and television. The federal court suit seeks an injunction to prevent SAG from negotiating for the extras, a role now performed by a separate union, the Screen Extras Guild. A SAG attorney, Leo Geffner, said the suit was premature because no decision has been made by SAG on whether it wants to represent the extras.