This documentary, filmed clandestinely, is based on several interviews with the executioners who worked in Spain during the early 1970s, as well as families of people executed by them.
| Directing | Basilio Martín Patino | Director |
| Editing | Eduardo Biurrun | Editor |
| Camera | Acácio de Almeida | Director of Photography |
| Camera | Augusto García Fernández-Balbuena | Director of Photography |
| Camera | Alfredo Mayo | Director of Photography |
| Writing | Basilio Martín Patino | Writer |
| Writing | Daniel Sueiro | Book |
