Warner Bros. has debuted another behind-the-scenes featurette for the upcoming Gangster Squad, director Ruben Fleischer's drama based on the true story of L.A.P.D. cops who went after mobster Mickey Cohen in the 1940s. Stars Ryan Gosling, Josh Brolin, Emma Stone, Anthony Mackie, and Giovanni Ribisi discuss their characters, and how this elevates the gangster genre to new heights. Get a crash course on this new crime saga before it hits theaters January 11.