Matt Donnelly Senior Film Writer The biceps and bro love will flow freely this December, as a new sports drama starring Zac Efron and Jeremy Allen White has been given the greenlight to conduct publicity from striking union SAG-AFTRA. “The Iron Claw,” about the ill-fated American pro wrestling family the Von Erichs, has received an interim agreement from the actors guild – meaning its stars are clear to promote the film around the world before it sees a wide release this holiday season.