Gangster Squad comes from director Ruben Fleischer and screenwriter Will Beal, featuring Josh Brolin, Sean Penn, Ryan Gosling, Emma Stone, Nick Nolte, Anthony Mackie, Giovanni Ribisi, Robert Patrick, and Michael Pena. Steve Jablonski composed the music, with Dion Beebee handling cinematography. Los Angeles is under siege by crime boss Mickey Cohen (Penn). Within a shadowy corner of the police department, a special…