Frank Warren is a treasury agent assigned to put an end to the activities of a powerful mob crime boss. Frank works undercover, posing as a criminal to seek information, but is frustrated when all he finds are terrified witnesses and corrupt police officers.
| Writing | Jack Rubin | Screenplay |
| Directing | Joseph H. Lewis | Director |
| Writing | Sydney Boehm | Screenplay |
| Production | Robert Rossen | Producer |
| Camera | Burnett Guffey | Director of Photography |
| Costume & Make-Up | Jean Louis | Costume Designer |
| Sound | George Duning | Music Director |
| Writing | Frank J. Wilson | Writer |
| Editing | Al Clark | Editor |
| Art | Walter Holscher | Art Direction |
| Art | William Kiernan | Set Decoration |
| Costume & Make-Up | Jean Louis | Costume Design |
| Costume & Make-Up | Greta Ardine | Hairstylist |
| Costume & Make-Up | Robert J. Schiffer | Makeup Artist |
| Directing | Wilbur McGaugh | Assistant Director |
| Sound | Jack A. Goodrich | Sound Engineer |
| Sound | George Duning | Music |
