The Asphalt Jungle is a 1950 film noir directed by John Huston. The heist film is based on the 1949 novel of the same name by W. R. Burnett and stars an ensemble cast including Sterling Hayden, Jean Hagen, Sam Jaffe, Louis Calhern, James Whitmore, and, in a minor but key role, Marilyn Monroe, an unknown at the time who was pictured but not mentioned on the posters. Wikipedia
Doc Riedenschneider: That copper, he recognized me. Cobby: How'd you know he was a copper? Doc Riedenschneider: I can smell one a block off. Cobby: Oh, don't worry about Ditrich. He's on my payroll. Practically a partner. Me and him, we're like that. (Cobby holds up his index and middle finger) Doc Riedenschneider: Experience has taught me never to trust a policeman. Just when you think one's all right, he turns legit.