How did T-Men use undercover treasury agents to tell its story?

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In the 1947 film T-Men, director Anthony Mann utilized the premise of undercover work to drive the narrative by casting Dennis O’Keefe and Alfred Ryder as treasury agents. These agents go undercover to infiltrate and dismantle a dangerous counterfeiting gang.1

This film is notable for marking the beginning of Mann’s collaboration with cinematographer John Alton, whose signature use of deep shadows and stark lighting helped establish the visual style of film noir.1