Gangster Squad

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When the classic Warner Bros. logo comes on the screen at the start of "Gangster Squad," it's in a tint that is somewhere between color and black and white. It holds out a two-fold promise: Los Angeles in 1949 brought back to life in the lavish style that only a Hollywood studio can provide, and a movie from the studio that made many of the greatest gangster films in Hollywood. The first part of the promise pays off.