- Donald Brittain
- Narrated by
- Lib Spry
- La Pasionária
- Kate Bader
- Self - Secretary, Friends of the Mackenzie-Papineau Battalion
- Hugh Garner
- Self - Private, International Brigade
- John G. Johnson
- Self - Private, International Brigade
- William Kardash
- Self - Lieutenant, International Brigade
- Paddy McGilligot
- Self - Lieutenant, International Brigade
- Len Norris
- Self - Corporal, International Brigade
- Marvin Penn
- Self - Hospital Administrator, International Brigade
- Joe Schoen
- Self - Lieutenant, International Brigade
- Graham Spry
- Self - Deputy Chairman, Committee to Aid Spanish Democracy
- Misha Storgoff
- Self - Sergeant, International Brigade
- Louis Tellier
- Self - Private, International Brigade
- Bob Turner
- Self - Sergeant, International Brigade
- James 'Red' Walsh
- Self - Political Commissar, Mackenzie-Papineau Battalion
- Saul Wellman
- Self - Political Commissar, Mackenzie-Papineau Battalion
- Manuel Azaña
- Self (watches farewell of International Brigades)
- Italo Balbo
- Self (behind Mussolini)
- R.B. Bennett
- Self - Discusses Unemployment
- Julián Besteiro
- Self (with Soviet ambassador)
- Léon Blum
- Self - Speaks Under Paix Sign
- Francisco Franco
- Self - Salutes Condor Legion
- Dolores Ibárruri
- Self - Makes Speech
- Vyacheslav Molotov
- Self - Behind Stalin
- Benito Mussolini
- Self - Shirtless at the Microphone
- Gonzalo Queipo de Llano
- Self - Turns Head
- Marcel Rozenberg
- Self - Soviet Ambassador, in Madrid
- Ramón Serrano Súñer
- Self - at Madrid Victory Parade Behind Franco
- Joseph Stalin
- Self - at the Kremlin
- José Sáenz
- Self (Nationalist general, with Falangists)
- Rafael Sánchez Masas
- Self (walks behind Franco)
- Wolfram von Richthofen
- Self (with Franco, partially visible)
- Luis de Zulueta
- Self (Republican Foreign Minister)
