Following the photos released last month, Warner Bros. has debuted the fourth poster for Gangster Squad, director Ruben Fleischer's crime drama that takes us back to 1940s Los Angeles. Josh Brolin and Ryan Gosling star as the leaders of a unit within the L.A.P.D. whose main goal is to get rid of gangster Mickey Cohen (Sean Penn) once and for all. Check out this one-sheet with Sean Penn brandishing a Tommy Gun, along with Josh Brolin, Ryan Gosling, and Emma Stone.

Gagster Squad Poster