Edward Renard
Kurt Schneider
Franz Schlager
Dr. Karl F. Kassell
Attorney Kellogg
Hilda Kleinhauer
Erika Wolf
Mrs. Schneider
British Military Intelligence Agent
Mrs. Liza Kassell (as Celia Sibelius)
Werner Renz
Dr. Julius Gustav Krogman (as Sig Rumann)
Hintze
Wildebrandt
Max Helldorf (as Hans von Twardowski)
Johann Westphal (as John Voigt)
Captain Richter (as Frederick Vogeding)
Greutzwald
Captain Straubel (as Robert Davis)
Captain von Eichen (as William Vaughn)
Klauber
U.S. District Court Judge
Mrs. Mary McLaughlin (as Ely Malyon)
Anna Keller - Passenger on Boat
Narrator (voice)
Nazi American Youth Leader (uncredited)
Nazi at Bund Meeting (uncredited)
Newsboy at End (uncredited)
American Legionnaire (uncredited)
Naval Officer Seeing Renard at Seaplane (uncredited)
Fritz Muller - German Agent (uncredited)
Shoeshine Boy (uncredited)
Man in Montage Stuffing Mailboxes (uncredited)
Radio Announcer (voice) (uncredited)
McGregor - Scottish Postman (uncredited)
Nazi Goon at Bund Meeting (uncredited)
Undetermined Secondary Role (uncredited)
German-American at Bund Meeting (uncredited)
Mrs. Anna Westphal (uncredited)
FBI Agent (uncredited)
American Legionnaire at Bund Meeting (uncredited)
Draftsman (uncredited)
FBI Chief (uncredited)
Man in Montage with Propaganda (uncredited)
Nazi Agent (uncredited)
Self (archive footage) (uncredited)
Soldier at Renz's Arrest (uncredited)
U.S. Government Agent (uncredited)
Customs Official (uncredited)
Harrison - Passport Official (uncredited)
Man Greeting Waiter Bill (archive footage) (uncredited)
Joseph Goebbels (uncredited)
Nazi at Meeting (uncredited)
FBI Agent Phillips (uncredited)
Bill - Coffee Shop Proprietor (uncredited)
Bill - Waiter with Coffee (uncredited)
FBI Agent 'Mac' MacDonald (uncredited)
Western Union Messenger (uncredited)
Kassel's Nurse (uncredited)
Naval Courier (uncredited)
Goebbels' Aide (uncredited)
Gottfried Simmons - Nazi Youth (uncredited)
Kranz (uncredited)
Driver of Nazi Car That Crashed (uncredited)
Army Hospital Clerk (uncredited)
Bismarck Officer with Crew List (uncredited)
FBI Agent Fred Young (uncredited)
U.S. Official (uncredited)
Fritz - von Eichen's Aide (uncredited)
Tom - in Coffee Shop (uncredited)
FBI Agent Staunton (uncredited)
Maj. Williams (uncredited)
Hotel Desk Clerk (uncredited)