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Manuel Azaña as Himself (President of Spain) |
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José Díaz as Himself (Parliamentarian) |
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Dolores Ibárruri as Herself |
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Enrique Lister as Himself (Republican Army) |
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Commander Martinez de Aragón as Himself (Republican Army) |
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Gustav Regler as Himself (German writer) |
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Orson Welles as Narrator (voice) |
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Ernest Hemingway as Narrator (voice) |
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Jean Renoir as Narrator (voice) |
| Writing | Prudencio de Pereda | Writer |
| Writing | John Dos Passos | Writer |
| Writing | Lillian Hellman | Writer |
| Writing | Archibald Macleish | Writer |
| Writing | Ernest Hemingway | Writer |
| Directing | Joris Ivens | Director |
| Writing | Joris Ivens | Writer |
| Sound | Virgil Thomson | Music |
| Editing | Helen van Dongen | Editor |
| Sound | Marc Blitzstein | Music Arranger |
| Camera | John Fernhout | Director of Photography |