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While inspired by real events, the film takes significant creative liberties:

The movie is a fictionalized account of the real-life , a secretive unit formed in 1946 to prevent East Coast organized crime from taking over Los Angeles. In the film, the squad engages in a "no-badges, no-mercy" street war to take down notorious mob boss Mickey Cohen (Sean Penn). Fact vs. Fiction

: The film's diverse squad includes characters played by Anthony Mackie and Michael Peña, but the actual 1940s unit was entirely Caucasian. Fuerza AntigГЎngster

: In the movie, Cohen is arrested for murder after a massive shootout. In reality, he was famously taken down by IRS agents for income tax evasion .

: While the movie portrays Keeler as the first member to die, the real-life Keeler outlived every other member of the original squad, passing away in 2012. Interesting Trivia While inspired by real events, the film takes

: The last two surviving members of the original Gangster Squad visited the set during production.

: The film was originally scheduled for a 2012 release but was delayed following the Aurora, Colorado theater shooting. A major climax involving a shootout in a movie theater had to be entirely rewritten and reshot. Fiction : The film's diverse squad includes characters

: Penn underwent three hours of makeup every morning to transform into the scarred and menacing Mickey Cohen.