- Ian Wolfe - Mr. Partlow
- Bessie Love - Mrs. Partlow
- MacIntyre Dixon - Carl Walters
- Pat Starr - Helen Walters
- Eleanor D. Wilson - Mrs. Reed
- Max Wright - Floyd Dell
- George Plimpton - Horace Whigham
- Harry Ditson - Maurice Becker
- Leigh Curran - Ida Rauh
- Kathryn Grody - Crystal Eastman
- Brenda Currin - Marjorie Jones
- Nancy Duiguid - Jane Heap
- Norman Chancer - Barney
- Dolph Sweet - Big Bill Haywood
- Ramon Bieri - Police Chief
- Jack O'Leary - Pinkerton Guard
- Gene Hackman - Pete van Wherry
- Gerald Hiken - Dr. Lorber
- William Daniels - Julius Gerber
- Dave King - Allan Benson
- Joseph Buloff - Joe Volski
- Stefan Gryff - Alex Gomberg
- Denis Pekarev - Interpreter in Factory
- Roger Sloman - Vladimir I. Lenin
- Stuart Richman - Leon Trotsky
- Oleg Kerensky - Alexander Kerensky / Himself - Witness
- Nikko Seppala - Young Bolshevik Soldier
- John J. Hooker - Senator Overman
- Shane Rimmer - MacAlpine
- Jerry Hardin - Harry
- Jack Kehoe - Eddie
- Christopher Malcolm - CLP Party Member #1
- Tony Sibbald - CLP Party Member #2
- R. G. Armstrong - Government Agent
- Josef Sommer - State Department Official
- Jan Tříska - Karl Radek
- Åke Lindman - Scandinavian Escort
- Pertti Weckström - Finnish Doctor
- Nina Macarova - Russian Nurse
- Jose De Fillippo - Russian Doctor
- Andreas La Casa - Little Boy
- Roger Baldwin - Himself - Witness
- Dora Russell - Herself - Witness
- Scott Nearing - Himself - Witness
- Tess Davis - Herself - Witness
- Heaton Vorse - Herself - Witness
- Hamilton Fish - Himself - Witness
- Will Durant - Himself - Witness
- Will Weinstone - Himself - Witness
- Emmanuel Herbert - Himself - Witness
- Arne Swabeck - Himself - Witness
- Adele Gutman Nathan - Herself - Witness
- George Seldes - Himself - Witness
- Kenneth Chamberlain - Himself - Witness
- Blanche Hays Fagen - Herself - Witness
- Galina von Meck - Herself - Witness
- Art Shields - Himself - Witness
- Andrew Dasburg - Himself - Witness
- Hugo Gellert - Himself - Witness
- Dorothy Frooks - Herself - Witness
- George Jessel - Himself - Witness
- Jacob Bailin - Himself - Witness
- John Ballato - Himself - Witness
- Lucita Williams - Herself - Witness
- Bernadine Szold-Fritz - Herself - Witness
- Jessica Smith - Herself - Witness
- Harry Carlisle - Himself - Witness
- Arthur Mayer - Himself - Witness
- Miriam Margolyes - Woman with Notebook (uncredited)
- John Ratzenberger - Communist Leader (uncredited)
- Simon Jones - Louise Bryant's Colleague in France (uncredited)
- Jill Goldston - Dancing Woman (uncredited)
- Michael Zimbrich
- Simon Relph
- Craig R. Baxley
- Trevor Griffiths
- Warren Beatty
- Noel Davis
- Jeremy Zimmermann
- Jak King
- Dave Grusin
- Dick Vorisek
- Michael Tronick
- Stephen Sondheim
Capítulo disponible en las siguientes plataformas:
