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| Broderick Crawford | Johnny Damico |
| Betty Buehler | Mary Kiernan |
| Richard Kiley | Tom Clancy |
| Otto Hulett | Police Lt. Banks |
| Matt Crowley | Smoothie/Blackie Clegg |
| Neville Brand | Gunner |
| Ernest Borgnine | Joe Castro |
| Walter Klavun | Police Sgt. Bennion |
| Lynn Baggett | Mrs. Peggy Clancy |
| Jean Alexander | Doris Clancy |
| Ralph Dumke | Police Commissioner |
After witnessing what appears to be a police officer shooting a man in cold blood, detective Johnny Damico decides to go undercover. Tracing the murder victim to a waterfront crime ring, Damico poses as longshoreman Tim Flynn, and infiltrates the corrupt New York dockworkers union. There he meets union toughs Joe Castro and Gunner, who eventually lead him to crime kingpin Blackie Clegg .
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