The inspiring movie Gangster Squad has been basically derived from a true story and a non fiction novel written by Paul Lieberman. The movie is very stylish and designed to make a very sleek output, but it has been given a very different kind of a look. The movie seems to be like the kind of a picture narrating the stories of blood and gore but there is a very deep message and story behind that. The theme of Gangster Squad has been basically taken from the true story. The story is about the mobster cop and the adventurous narration of the activities of the Los Angeles police who successfully arrested the powerful gangsters in 1949. The beginning of the Gangster Squad is in a very dramatic way in which the destruction of the whole Los Angeles has been shown. The whole corporate lot along with the politicians and police are being controlled by a very ruthless mafia don. This character is being played by Mickey Cohen.