Leslie Howard

Character: Stephen 'Steve' Locke

Kay Francis

Character: Elena Moura

William Gargan

Character: Bob Medill

Phillip Reed

Character: Gaston LeFarge

Irving Pichel

Character: Sergei Pavlov

Ivan F. Simpson

Character: 'Poohbah' Evans

Halliwell Hobbes

Character: Sir Walter Carrister

J. Carrol Naish

Character: Commissioner of War Trotsky

Walter Byron

Character: Under Secretary Stanley

Cesar Romero

Character: Tito Del Val

Arthur Aylesworth

Character: Mr. Henry Farmer

Alphonse Ethier

Character: Paul DeVigney

Frank Reicher

Character: Mr. X

Tenen Holtz

Character: Lenin

Doris Lloyd

Character: Lady Carrister

Mary Forbes

Character: Lady Catherine Trehearne

Marina Koshetz

Character: Maria Nikolaievna (as Marina Schubert)

George C. Pearce

Character: Lloyd George (as George Pearce)

Gregory Gaye

Character: Mr. Kolinoff

Paul Porcasi

Character: Count Romano

Glen Cavender

Character: Russian Policeman (uncredited)

Claire McDowell

Character: Woman Saying 'Lenin will Live' (uncredited)