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In the naive, heavy-handed, handsomely designed Gangster Squad, he's played as a preening, psychopathic monster by Sean Penn. We first see him using two cars to tear a Chicago interloper in two behind the "Hollywoodland" sign, thus establishing him as the monster who's corrupting the pure, law-abiding Los Angeles.

The film is virtually a cross between those 1970s thrillers in which Vietnam veterans return home to clean up their tarnished homeland and Brian De Palma's The Untouchables, where Kevin Costner's Eliot Ness recruits an elite band of cops to break Al Capone's stranglehold hold on prohibition Chicago. The leader of the special crime squad appointed by gravel-voiced police chief Nick Nolte(star of Mulholland Falls) is second world war hero Sergeant O'Mara (Josh Brolin), whose wife and team are virtually identical to Ness's. The trouble is that O'Mara, as well as being extremely brutal, is thick as two short night sticks. His only strategy (which recalls Ronnie Barker in a famous Two Ronnies parody of The Colditz Story) is to rush in through the doors of illegal casinos, brothels and nightclubs firing in every direction.

There are a few good lines here and there (eg O'Mara's chief lieutenant remarks of the attempt to reform LA: "The whole town is underwater and you're grabbing a bucket when you should be grabbing a bathing suit"). But the story has little connection to reality. The film is set entirely in 1949, when in fact Cohen wasn't put away until first 1950 and then, finally, in 1961 and, as with Capone, it was accountants that brought him down, not thuggish cops.

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