Chronicle of the repression that a foreign company exerts on the miners of a small nitrate town in Chile, whose workers decide to claim their most essential rights. A reflection of the historic union struggles in the northern Chile that ended with terrible repressive acts.
| Directing | Miguel Littín | Director |
| Writing | Miguel Littín | Writer |
| Camera | Jorge Stahl Jr. | Director of Photography |
| Sound | Míkis Theodorakis | Original Music Composer |
| Editing | Alberto Valenzuela | Editor |
| Editing | Ramón Aupart | Editor |
| Sound | Abraham Cruz | Sound Editor |
| Art | Raúl Serrano | Set Decoration |
| Sound | José B. Carles | Sound |
| Art | Agustín Ituarte | Set Designer |
| Sound | Gonzalo Gavira | Other |
| Writing | Patricio Manns | Original Story |
