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The onscreen credits include the following written prologue: "Dedicated to the Customs Agents of the U.S. Treasury Department, without whose assistance this film could not have been made." The film contains intermittent voice-over narration spoken by Dean Jagger. Although the credits read: "And introducing Harry Landers," this was not his film debut. According to information in the MPAA/PCA Collection at the AMPAS Library, the script was developed from Berne Giler's and producer/director Joseph Lerner's original idea. The Daily Variety review notes that the story was "based on facts" from the Customs Dept. files. The film was shot on location in New York City.
In a modern interview, Lerner recalled that he used fifteen or eighteen sets, disposing of them once the day's shooting was done. All of the film's sound was recorded live, Lerner said: "You'll find no dubbing in that picture at all. No extra sound effects whatsoever." Lerner also recalled how his crew improvised a camera car using a Chevrolet convertible from the Hertz rental car agency. The car's hood and trunk were replaced with plywood platforms with built-in high hats. Lerner noted that the same sound recording and camera car techniques were used on Guilty Bystander (see below). C-Man was director of photography Gerald Hirschfeld's first professional job after leaving the Army.