 Leslie HowardStephen 'Steve' Locke | Stephen 'Steve' Locke |
 Kay FrancisElena Moura | Elena Moura |
 William GarganBob Medill | Bob Medill |
 Phillip ReedGaston LeFarge | Gaston LeFarge |
 Irving PichelSergei Pavlov | Sergei Pavlov |
 Ivan F. Simpson'Poohbah' Evans | 'Poohbah' Evans |
 Halliwell HobbesSir Walter Carrister | Sir Walter Carrister |
 J. Carrol NaishCommissioner of War Trotsky | Commissioner of War Trotsky |
 Walter ByronUnder Secretary Stanley | Under Secretary Stanley |
 Cesar RomeroTito Del Val | Tito Del Val |
 Arthur AylesworthMr. Henry Farmer | Mr. Henry Farmer |
 Alphonse EthierPaul DeVigney | Paul DeVigney |
 Frank ReicherMr. X | Mr. X |
 Tenen HoltzLenin | Lenin |
 Doris LloydLady Carrister | Lady Carrister |
 Mary ForbesLady Catherine Trehearne | Lady Catherine Trehearne |
 Marina KoshetzMaria Nikolaievna (as Marina Schubert) | Maria Nikolaievna (as Marina Schubert) |
 George C. PearceLloyd George (as George Pearce) | Lloyd George (as George Pearce) |
 Gregory GayeMr. Kolinoff | Mr. Kolinoff |
 Paul PorcasiCount Romano | Count Romano |
 Glen CavenderRussian Policeman (uncredited) | Russian Policeman (uncredited) |
 Claire McDowellWoman Saying 'Lenin will Live' (uncredited) | Woman Saying 'Lenin will Live' (uncredited) |
