- Frederic Prokoschnovel "The Conspirators" (as Fredric Prokosch)
- Vladimir Poznerscreenplay and
- Leo Rostenscreenplay
- Jack Moffittadditional dialogue
- Eduardo Ciannelli(as Edward Ciannelli)
Rest of cast listed alphabetically
- Eddie Abdo(uncredited)
- Alex Akimoff(uncredited)
- Luis Alberni(uncredited)
- Carlos Albert(uncredited)
- Rafael Alcayde(uncredited)
- Fred Aldrich(uncredited)
- John Arnold(uncredited)
- Larry Arnold(uncredited)
- Trevor Bardette(uncredited)
- Robert Barron(uncredited)
- Eugene Beday(uncredited)
- Leon Belasco(uncredited)
- Edward Biby(uncredited)
- George Blagoi(uncredited)
- Eumenio Blanco(uncredited)
- John Bleifer(uncredited)
- Willie Bloom(uncredited)
- Monte Blue(uncredited)
- Carla Boehm(uncredited)
- Walter Bonn(uncredited)
- Nick Borgani(uncredited)
- Dick Botiller(uncredited)
- Paul Bradley(uncredited)
- Maurice Brierre(uncredited)
- Frederic Brunn(uncredited)
- Clinton Carey(uncredited)
- Steve Carruthers(uncredited)
- Tony Carson(uncredited)
- Anthony Caruso(uncredited)
- Jack Chefe(uncredited)
- Victor Cox(uncredited)
- Oliver Cross(uncredited)
- Mina Cunard(uncredited)
- Paul De Corday(uncredited)
- Rod De Medici(uncredited)
- Sayre Dearing(uncredited)
- Jack Deery(uncredited)
- Carl Deloro(uncredited)
- Adrian Droeshout(uncredited)
- Gordon Dumont(uncredited)
- Fred Fisher(uncredited)
- Raoul Freeman(uncredited)
- Arno Frey(uncredited)
- Ben Frommer(uncredited)
- Curt Furberg(uncredited)
- Michael Gastone(uncredited)
- Gregory Gaye(uncredited)
- Rudy Germane(uncredited)
- Joe Gilbert(uncredited)
- Fred Godoy(uncredited)
- George Golden(uncredited)
- Christine Gordon(uncredited)
- Sol Gorss(uncredited)
- Oscar Gould(uncredited)
- Ross Gould(uncredited)
- Herschel Graham(uncredited)
- Charles Haefeli(uncredited)
- Ludwig Hardt(uncredited)
- Sam Harris(uncredited)
- Gordon Harrison(uncredited)
- Shep Houghton(uncredited)
- Eddie Hyans(uncredited)
- Gertrude Keeler(uncredited)
- Hal Kelly(uncredited)
- Serge Krizman(uncredited)
- Isabel La Mal(uncredited)
- Mike Lally(uncredited)
- Louise Lane(uncredited)
- Max Linder(uncredited)
- Doris Lloyd(uncredited)
- Oscar Loraine(uncredited)
- Jacques Lory(uncredited)
- Manuel López(uncredited)
- Wilbur Mack(uncredited)
- John Marlin(uncredited)
- Alphonse Martell(uncredited)
- Thomas Martin(uncredited)
- Harro Meller(uncredited)
- Louis Mercier(uncredited)
- Art Miles(uncredited)
- Harold Miller(uncredited)
- Aurora Miranda(uncredited)
- Hans Moebus(uncredited)
- Mike Morelli(uncredited)
- Neyle Morrow(uncredited)
- John Moss(uncredited)
- Carmel Myers(uncredited)
- John Mylong(uncredited)
- Carl Neubert(uncredited)
- Roger Neury(uncredited)
- Anton Northpole(uncredited)
- Jay Novello(uncredited)
- Fred Nurney(uncredited)
- Manuel París(uncredited)
- Veronica Pataky(uncredited)
- Tony Paton(uncredited)
- Nita Pike(uncredited)
- Paul Power(uncredited)
- Emil Rameau(uncredited)
- Paul Ravel(uncredited)
- Paul Regas(uncredited)
- Pedro Regas(uncredited)
- Frank Reicher(uncredited)
- Otto Reichow(uncredited)
- Suzanne Ridgway(uncredited)
- William Roy(uncredited)
- Jack Santoro(uncredited)
- Alexander Sascha(uncredited)
- Harry Semels(uncredited)
- Michael Smith(uncredited)
- Leonid Snegoff(uncredited)
- George Sorel(uncredited)
- Larry Steers(uncredited)
- Count Stefenelli(uncredited)
- Norman Stevans(uncredited)
- Buddy Sullivan(uncredited)
- Marguerita Sylva(uncredited)
- Robert Tafur(uncredited)
- Hal Taggart(uncredited)
- Tom Tamarez(uncredited)
- Alex Tamaroff(uncredited)
- Nick Thompson(uncredited)
- Edwin Tuttle(uncredited)
- Philip Van Zandt(uncredited)
- Juan Varro(uncredited)
- Ernö Verebes(uncredited)
- Jack Watt(uncredited)
- Peggy Watts(uncredited)
- Crane Whitley(uncredited)
- Jack Wise(uncredited)
- Beal Wong(uncredited)
- Sonya Yarr(uncredited)
- Jack Chertokproducer
- Jack L. Warnerexecutive producer
- Arthur Edesondirector of photography
- Walter F. Tilfordset decorator (as Walter Tilford)
- Leah Rhodescostume designer (gowns)
- Perc Westmoremakeup artist
- Bill Cooleymakeup artist (uncredited)
- Al Greenwaymakeup artist (uncredited)
- Jean Burt Reillyhair stylist (uncredited)
- John Wallacemakeup artist (uncredited)
- Ridgeway Callowassistant director (uncredited)
- Clarence Euristsecond assistant director (uncredited)
- Don Siegelassistant director (uncredited)
- Budd Friendprops (uncredited)
- Gerald W. Alexandersound effects mixer (uncredited) / sound re-recordist (uncredited)
- Robert G. Waynesound effects mixer (uncredited) / sound re-recordist (uncredited)
- William C. McGannspecial effects director (as William McGann)
- Willard Van Engerspecial effects
- Paul Detlefsenmatte paintings (uncredited)
- William Congergaffer (uncredited)
- Milton Goldstill photographer (uncredited)
- Wally Meinardusassistant camera (uncredited)
- Bert Shipmansecond camera operator (uncredited)
- William Steudemanbest boy (uncredited)
- Mildred Duncanwardrobe (uncredited)
- Eugene Joseffjeweller (uncredited)
- Marie Pickeringwardrobe (uncredited)
- Leon Robertswardrobe (uncredited)
- Leo F. Forbsteinmusical director
- Leonid Raaborchestrator
- Charles David Forrestmusic mixer (uncredited)
- Hugo Friedhofercomposer: additional music (uncredited)
- Gloria Faythescript clerk (uncredited)
- Henry Da Silvatechnical advisor
- Herschel Daughertydialogue director
- James Leicestermontages
- Mario Almiranteitalian voice dubbing: Vladimir Sokoloff (uncredited)
- Mario Besestiitalian voice dubbing: Sydney Greenstreet (uncredited)
- Giorgio Capecchiitalian voice dubbing: Joseph Calleia (uncredited)
- Ennio Cerlesiitalian voice dubbing: Paul Henreid (uncredited)
- Lauro Gazzoloitalian voice dubbing: Peter Lorre (uncredited)
- Ruth Robertsdialect coach: Hedy Lamarr (uncredited)
- Giovanna Scottoitalian voice dubbing: Hedy Lamarr (uncredited)
Crew verified as complete
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