Set against the glamorous yet gritty backdrop of 1949 Los Angeles, 'Gangster Squad' delivers a stylized, action-packed take on a true crime story. The film follows Sgt. John O'Mara (Josh Brolin), a morally rigid WWII veteran tasked with forming an off-the-books police unit to dismantle the empire of ruthless mob kingpin Mickey Cohen (Sean Penn). This secret 'gangster squad' operates outside the law, using Cohen's own brutal tactics against him, and includes the charismatic Sgt. Jerry Wooters (Ryan Gosling), who becomes romantically entangled with Cohen's moll, Grace Faraday (Emma Stone).

Director Ruben Fleischer ('Zombieland') crafts a visually striking period piece, drenched in neon and shadow, that prioritizes explosive set pieces and sharp dialogue. While the plot follows familiar crime drama beats, the film's strength lies in its ensemble cast. Brolin embodies stoic determination, Gosling provides charming wit, and Penn delivers a scenery-chewing, monstrous performance as the vicious Cohen. The action sequences are brutal and inventive, particularly a climactic shootout in the historic Hotel Roosevelt.

Viewers should watch 'Gangster Squad' for its potent mix of classic gangster movie tropes and modern cinematic flair. It's a fast-paced, entertaining ride that offers a fictionalized glimpse into LA's criminal underworld, bolstered by strong performances and impeccable production design. Despite its historical liberties, the film succeeds as a thrilling homage to film noir and a compelling story about the blurred lines between justice and vengeance in a corrupt city.