 | Gian Maria Volonté als Bartolomeo Vanzetti |
 | Riccardo Cucciolla als Nicola Sacco |
 | Cyril Cusack als Frederick Katzmann |
 | Rosanna Fratello als Rosa Sacco |
 | Geoffrey Keen als Judge Webster Thayer |
 | Milo O’Shea als Fred Moore |
 | William Prince als William Thompson |
 | Claude Mann als Eddie |
 | Edward Jewesbury als Alvan T. Fuller |
 | Armenia Balducci als Virginia Vanzetti |
 | Valentino Orfeo als Celestino Madeiros |
 | Pier Giovanni Anchisi als Defense Committee member |
| Desmond Perry als Lieutenant |
 | John Harvey als Minister Palmer |
| Felicity Mason |
 | Marisa Fabbri als Mary Splaine |
| Claudio Sora als Joe Morelli |
| Maria Grazia Marescalchi als Brini |
 | Giacomo Piperno als Pelser |
 | Sergio Fantoni als Consul Giuseppe Andrower |
| Sergio Serafini |
| Giorgio Dolfin |
| Armando Tortorici als (uncredited) |
 | Mario Ingrassia als Court Officer (uncredited) |
| Giuliano Montaldo | Director |
| Giuliano Montaldo | Story |
| Fabrizio Onofri | Story |
| Mino Roli | Story |
| Fabrizio Onofri | Screenplay |
| Giuliano Montaldo | Screenplay |
| Aurelio Crugnola | Production Design |
| Silvano Ippoliti | Director of Photography |
| Nino Baragli | Editor |
| Arrigo Colombo | Producer |
| Giorgio Papi | Producer |
| Enrico Sabbatini | Costume Design |
| Ennio Morricone | Original Music Composer |
| Piero Donati | Production Manager |
| Stefano Rolla | First Assistant Director |
| Lorenzo Magnolia | First Assistant Director |
| Vera Pescarolo | Second Assistant Director |
| Vittoria Vigorelli | Script Supervisor |
| Ennio Di Meo | Unit Manager |
| Franco Fumagalli | Unit Manager |
| Dino Di Dionisio | Production Secretary |
| Enrico Sasso | Camera Operator |
| Renato Doria | Assistant Camera |
| Mario Mazzoni | Still Photographer |
| Luigi Quintili | Assistant Production Design |
| Maria Teresa Barbasso | Assistant Production Design |
| Andreina Casini | Assistant Editor |
| Lamberto Marini | Makeup Artist |
| Ernesta Cesetti | Hairstylist |
| Aldo De Martino | Sound |
