- John Ireland
- Investigator John Williams
- Richard Denning
- Chief Investigator Paul Reagan
- Suzanne Dalbert
- Margo Wayne
- Robert Foulk
- Cmdr. Jackson
- Mike Connors
- Lt. Magrew
- Richard Avonde
- Buzz Olin
- William Bryant
- FBI Agent in Montage
- Cicely Browne
- Blonde Woman
- Tommy Farrell
- Agent Reynolds
- Joseph Mell
- Box of Taffy Man at Penn Station
- Robert Hunter
- Andy - alias Andre, an agent
- Peter Marshall
- Leo Wayne
- Chris Alcaide
- Agent Manning
- Robert Bice
- Detective
- Nesdon Booth
- Sheriff Ramirez
- Morgan Brown
- Penn Station Counterman
- Michael Colgan
- Agent Gray
- James Conaty
- Elevator Passenger / FBI Agent (uncredited)
- Heinie Conklin
- Go-Between with Satchel
- George Dee
- Pierre Neff
- Jean Del Val
- Agent Maurice Leroux
- Lester Dorr
- Lindsley - Lab Tech
- Clark Howat
- Sands
- Guy Kingsford
- Police Captain
- Tom McKee
- Pilot
- George Milan
- Dave Norton
- Gerald Mohr
- Narrator
- Michèle Montau
- Cabaret Singer
- Boyd 'Red' Morgan
- Corrigan
- Lee Morgan
- Mack
- Bud Osborne
- Courier Who Got Bag at Bar
- Steve Pendleton
- Technician
- Barney Phillips
- Undetermined Role
- Sandy Sanders
- Lifeguard
- Guy Way
- FBI Agent at Meeting
- Robert B. Williams
- Sub Chief
