- Donald Hamiltonnovels "The Silencers" and "Death of a Citizen"
- Oscar Saulscreenplay
- John Reach(scenes deleted)
Rest of cast listed alphabetically
- Martin Abrahams(uncredited)
- Todd Armstrong(uncredited)
- Barbara Burgess(uncredited)
- Vikki Carr(singing voice) (uncredited)
- Amadee Chabot(uncredited)
- Carol Cole(uncredited)
- Myron Cook(uncredited)
- Bill Couch(uncredited)
- John Daheim(uncredited)
- Dirk Evans(uncredited)
- Virginia Ann Ford(uncredited)
- Robert Glenn(uncredited)
- George Golden(uncredited)
- Joe Gray(uncredited)
- Frank Hagney(uncredited)
- Ed Haskett(uncredited)
- Patrick Hawley(uncredited)
- Chuck Hicks(uncredited)
- George Hoagland(uncredited)
- Harry Holcombe(uncredited)
- Susan Holloway(uncredited)
- Thomas Horton(uncredited)
- Ted Jordan(uncredited)
- Art Koulias(uncredited)
- Gary Lasdun(uncredited)
- Anna Lavele(uncredited)
- Grace Lee(uncredited)
- Nelson Leigh(uncredited)
- Victoria Lockwood(uncredited)
- Gay MacGill(uncredited)
- Gigi Michel(uncredited)
- Hans Moebus(uncredited)
- Ray Montgomery(uncredited)
- Inga Neilsen(uncredited)
- Margie Nelson(uncredited)
- Scott Perry(uncredited)
- Pat Renella(uncredited)
- Leoda Richards(uncredited)
- Bruce Ritchey(uncredited)
- Pamela Rodgers(uncredited)
- Clark Ross(uncredited)
- Cosmo Sardo(uncredited)
- Jeffrey Sayre(uncredited)
- Robert F. Simon(uncredited)
- Tom Steele(uncredited)
- Margaret Teele(uncredited)
- Rita Thiel(uncredited)
- Larri Thomas(uncredited)
- Glenn Thompson(uncredited)
- Marilyn Tindall(uncredited)
- Richard Tretter(uncredited)
- Vincent Van Lynn(uncredited)
- Robert Ward(uncredited)
- Jan Watson(uncredited)
- Guy Wilkerson(uncredited)
- Irving Allenproducer
- Dean Martinexecutive producer (uncredited)
- James Schmererassociate producer (as Jim Schmerer)
- Burnett Guffeydirector of photography
- Joseph C. Wrightart director (as Joe Wright)
- Virginia Joneshair stylist
- Ralph E. Blackunit production manager (as Ralph Black)
- Sergei Petschnikoffunit production manager (as Sergei Petchnikoff)
- James Curtis Havenssecond unit director (as James Havens)
- Clark L. Paylowassistant director (as Clark Paylow)
- Robert W. Kingcraft service (uncredited)
- Lambert E. Daysound (as Lambert Day)
- Charles J. Ricesound supervisor
- Marlowe Newkirkspecial effects (uncredited)
- Bill Couchstunts (uncredited)
- John Daheimstunts (uncredited)
- Bob Herronstunts (uncredited)
- Chuck Hicksstunts (uncredited)
- Carey Loftinstunts (uncredited)
- Gil Perkinsstunts (uncredited)
- Tom Steelestunts (uncredited)
- Dave Friedmanassistant camera (uncredited)
- Roger Boyceadditional music
- Elmer Bernsteinconductor (uncredited)
- Jack Hayesorchestrator (uncredited)
- Emil Richardsmusician: percussion (uncredited)
- Howard Robertsmusician: guitar (uncredited)
- Leo Shukenorchestrator (uncredited)
- Herbert Bakerparodies
- Robert Sidneychoreographer
- George Barriscar customizer (uncredited)
- Wayne Fitzgeraldtitle designer (uncredited)
- Jean-Étienne Siryposter designer (french version) (uncredited)
Crew verified as complete
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