: The technical expert and moral compass who bugs Cohen's home.
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 Gangster Squad
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: : The technical expert and moral compass who