Edward G. Robinson
Role: Edward 'Ed' Renard
Francis Lederer
Role: Kurt Schneider
George Sanders
Role: Franz Schlager
Paul Lukas
Role: Dr. Kassell
Henry O'Neill
Role: Attorney Kellogg
Dorothy Tree
Role: Hilda Kleinhauer
Grace Stafford
Role: Mrs. Schneider
James Stephenson
Role: British Military Intelligence Agent
Hedwiga Reicher
Role: Mrs. Kassell
Joe Sawyer
Role: Werner Renz
Henry Victor
Role: Wildebrandt
Hans Heinrich von Twardowski
Role: Helldorf
Wolfgang Zilzer
Role: Westphal
Frederick Vogeding
Role: Captain Richter
Willy Kaufman
Role: Greutzwald
Rudolph Anders
Role: Captain Straubel
Wilhelm von Brincken
Role: Captain von Eichen
George Rosener
Role: Klauber
Frederick Burton
Role: U.S. District Court Judge
Eily Malyon
Role: Mrs. McLaughlin
Bodil Rosing
Role: Passenger on Boat
John Deering
Role: Narration by
Louis Adlon
Role: Nazi American Youth Leader (uncredited)
Fred Aldrich
Role: Nazi at Bund Meeting (uncredited)
Sherwood Bailey
Role: Newsboy at End (uncredited)
Ward Bond
Role: American Legionnaire (uncredited)
Walter Bonn
Role: Naval Officer Seeing Renard at Seaplane (uncredited)
Egon Brecher
Role: Fritz Muller - German Agent (uncredited)
Tommy Bupp
Role: Shoeshine Boy (uncredited)
Glen Cavender
Role: Man in Montage Stuffing Mailboxes (uncredited)
John Conte
Role: Radio Announcer (voice) (uncredited)
Alec Craig
Role: McGregor - Scottish Postman (uncredited)
Jimmie Dundee
Role: Nazi Goon at Bund Meeting (uncredited)
Jack Egger
Role: (uncredited)
Frederick Giermann
Role: German-American at Bund Meeting (uncredited)
Lisa Golm
Role: Mrs. Anna Westphal (uncredited)
Sol Gorss
Role: Nazi Goon at Bund Meeting (uncredited)
William Gould
Role: FBI Agent (uncredited)
Fred Graham
Role: American Legionnaire at Bund Meeting (uncredited)
Creighton Hale
Role: Draftsman (uncredited)
John Hamilton
Role: FBI Chief (uncredited)
John Harron
Role: Man in Montage with Propaganda (uncredited)
Eddie Hart
Role: Nazi Agent (uncredited)
Adolf Hitler
Role: Self (archive footage) (uncredited)
Max Hoffman Jr.
Role: Soldier at Renz's Arrest (uncredited)
Stuart Holmes
Role: Draftsman (uncredited)
Arthur Stuart Hull
Role: U.S. Government Agent (uncredited)
Selmer Jackson
Role: Customs Official (uncredited)
Edward Keane
Role: FBI Agent (uncredited)
Robert Emmett Keane
Role: Harrison - Passport Official (uncredited)
Milton Kibbee
Role: Man Greeting Waiter Bill (archive footage) (uncredited)
Martin Kosleck
Role: Joseph Goebbels (uncredited)
Frank Mayo
Role: FBI Agent Phillips (uncredited)
Lon McCallister
Role: (uncredited)
Ray Miller
Role: Bill - Coffee Shop Proprietor (uncredited)
Walter Miller
Role: Bill - Waiter with Coffee (uncredited)
Jack Mower
Role: FBI Agent 'Mac' MacDonald (uncredited)
George Offerman, Jr.
Role: Western Union Messenger (uncredited)
Lotte Palfi Andor
Role: Kassel's Nurse (uncredited)
Steve Pendleton
Role: Naval Courier (uncredited)
Gil Perkins
Role: Goebbels' Aide (uncredited)
Norman Phillips Jr.
Role: Gottfried Simmons - Nazi Youth (uncredited)
Tempe Pigott
Role: (uncredited)
Lucien Prival
Role: Kranz (uncredited)
Otto Reichow
Role: Driver of Nazi Car That Crashed (uncredited)
John Ridgely
Role: Army Hospital Clerk (uncredited)
Ferdinand Schumann-Heink
Role: (uncredited)
Hans Schumm
Role: Bismarck Officer with Crew List (uncredited)
Lester Sharpe
Role: (uncredited)
Charles Sherlock
Role: FBI Agent Fred Young (uncredited)
Edwin Stanley
Role: U.S. Official (uncredited)
Rudolf Steinboeck
Role: (uncredited)
Robert R. Stephenson
Role: Fritz - von Eichen's Aide (uncredited)
Regis Toomey
Role: Tom - in Coffee Shop (uncredited)
Frederic Tozere
Role: FBI Agent Staunton (uncredited)
Charles Trowbridge
Role: Maj. Williams (uncredited)
Emmett Vogan
Role: Hotel Desk Clerk (uncredited)
Dave Wengren
Role: (uncredited)