Critics often describe Gangster Squad as more of a "costume party" than a traditional film noir. While the film captures the glamorous, sleek aesthetic of post-war L.A. through impeccable costume design and vibrant cinematography, it often falls into the trap of overusing clichés.

The primary conflict is a moral and physical battle between the squad's guerrilla tactics and the sadistic savagery of Mickey Cohen (Sean Penn), who views himself as the master of his own "Manifest Destiny". Style vs. Substance

The narrative centers on Sergeant John O'Mara (Josh Brolin), a veteran and honest cop who is authorized by Police Chief William Parker (Nick Nolte) to form a secret squad to dismantle Cohen’s criminal empire. The squad functions as a "fellowship" of specialists, including: