Los Angeles, 1949. Ruthless, Brooklyn-born mob king Mickey Cohen (Sean Penn) runs the show in this town, reaping the ill-gotten gains from the drugs, the guns, the prostitutes and-if he has his way-every wire bet placed west of Chicago. And he does it all with the protection of not only his own paid goons, but also the police and the politicians who are under his control. It's enough to intimidate even the bravest, street-hardened cop...except, perhaps, for the small, secret crew of LAPD outsiders led by Sgt. John O'Mara (Josh Brolin) and Jerry Wooters (Ryan Gosling), who come together to try to tear Cohen's world apart. -- (C) Warner Bros
In the film, the Gangster Squad is assembled to go after Mickey Cohen. However, in real life Chief W.H. Parker set up the squad to prevent other gangsters from taking over Cohen's rackets after Cohen went to prison on income tax evasion. Whenever the squad learned that out-of-town gangsters were coming to Los Angeles to try to set up new operations, the Gangster Squad would kidnap them, beat them up (some rumors say torture) and then send them back to wherever they came from with the warning that if they ever returned, they would be killed.
Sean Penn had to spend three hours on makeup every morning.
The film's original trailer was pulled after the Aurora, Colorado, Century 16 theater massacre due to a shot in which four gangsters fire machine guns through a projection screen into a crowded movie theater. Warner Bros. ordered the film back into production for a reshoot of the scene, necessitating a rescheduling of the film's release and rewrite of the script.
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