Edward G. Robinson

Edward 'Ed' Renard

Francis Lederer

Kurt Schneider

George Sanders

Franz Schlager

Paul Lukas

Dr. Kassell

Henry O'Neill

Attorney Kellogg

Dorothy Tree

Hilda Kleinhauer

Lya Lys

Erika Wolf

Grace Stafford

Mrs. Schneider

James Stephenson

British Military Intelligence Agent

Hedwiga Reicher

Mrs. Kassell

Joe Sawyer

Werner Renz

Sig Ruman

Krogman

Lionel Royce

Hintze

Hans Heinrich von Twardowski

Helldorf

Wolfgang Zilzer

Westphal

Frederick Vogeding

Captain Richter

Rudolph Anders

Captain Straubel

Wilhelm von Brincken

Captain von Eichen

Frederick Burton

U.S. District Court Judge

Eily Malyon

Mrs. McLaughlin

Bodil Rosing

Passenger on Boat

Louis Adlon

Nazi American Youth Leader (uncredited)

Fred Aldrich

Nazi at Bund Meeting (uncredited)

Sherwood Bailey

Newsboy at End (uncredited)

Ward Bond

American Legionnaire (uncredited)

Egon Brecher

Fritz Muller - German Agent (uncredited)

Tommy Bupp

Shoeshine Boy (uncredited)

Glen Cavender

Man in Montage Stuffing Mailboxes (uncredited)

John Conte

Radio Announcer (voice) (uncredited)

Alec Craig

McGregor - Scottish Postman (uncredited)

Lisa Golm

Mrs. Anna Westphal (uncredited)

William Gould

FBI Agent (uncredited)

Fred Graham

American Legionnaire at Bund Meeting (uncredited)

Creighton Hale

Draftsman (uncredited)

John Hamilton

FBI Chief (uncredited)

John Harron

Man in Montage with Propaganda (uncredited)

Adolf Hitler

Self (archive footage) (uncredited)

Max Hoffman Jr.

Soldier at Renz's Arrest (uncredited)

Stuart Holmes

Draftsman (uncredited)

Arthur Stuart Hull

U.S. Government Agent (uncredited)

Selmer Jackson

Customs Official (uncredited)

Edward Keane

FBI Agent (uncredited)

Robert Emmett Keane

Harrison - Passport Official (uncredited)

Milton Kibbee

Man Greeting Waiter Bill (archive footage) (uncredited)

Martin Kosleck

Joseph Goebbels (uncredited)

Frank Mayo

FBI Agent Phillips (uncredited)

Lon McCallister

(uncredited)

Walter Miller

Bill - Waiter with Coffee (uncredited)

Jack Mower

FBI Agent 'Mac' MacDonald (uncredited)

George Offerman, Jr.

Western Union Messenger (uncredited)

Steve Pendleton

Naval Courier (uncredited)

Tempe Pigott

(uncredited)

Lucien Prival

Kranz (uncredited)

Otto Reichow

Driver of Nazi Car That Crashed (uncredited)

John Ridgely

Army Hospital Clerk (uncredited)

Ferdinand Schumann-Heink

(uncredited)

Lester Sharpe

(uncredited)

Charles Sherlock

FBI Agent Fred Young (uncredited)

Edwin Stanley

U.S. Official (uncredited)

Regis Toomey

Tom - in Coffee Shop (uncredited)

Frederic Tozere

FBI Agent Staunton (uncredited)

Charles Trowbridge

Maj. Williams (uncredited)

Emmett Vogan

Hotel Desk Clerk (uncredited)