 Gian Maria VolontéBartolomeo Vanzetti | Bartolomeo Vanzetti |
 Riccardo CucciollaNicola Sacco | Nicola Sacco |
 Cyril CusackFrederick Katzmann | Frederick Katzmann |
 Rosanna FratelloRosa Sacco | Rosa Sacco |
 Geoffrey KeenJudge Webster Thayer | Judge Webster Thayer |
 Milo O'SheaFred Moore | Fred Moore |
 William PrinceWilliam Thompson | William Thompson |
 Claude MannEddie | Eddie |
 Edward JewesburyAlvan T. Fuller | Alvan T. Fuller |
 Armenia BalducciVirginia Vanzetti | Virginia Vanzetti |
| VValentino OrfeoCelestino Madeiros | Celestino Madeiros |
 Pier Giovanni AnchisiDefense Committee member | Defense Committee member |
| DDesmond PerryLieutenant | Lieutenant |
 John HarveyMinister Palmer | Minister Palmer |
| FFelicity MasonNot listed | Not listed |
 Marisa FabbriMary Splaine | Mary Splaine |
| CClaudio SoraJoe Morelli | Joe Morelli |
 Maria Grazia MarescalchiBrini | Brini |
 Giacomo PipernoPelser | Pelser |
 Sergio FantoniConsul Giuseppe Andrower | Consul Giuseppe Andrower |
 Sergio SerafiniNot listed | Not listed |
 Giorgio DolfinNot listed | Not listed |
 Armando Tortorici(uncredited) | (uncredited) |
 Mario IngrassiaCourt Officer (uncredited) | Court Officer (uncredited) |
 Osvaldo PeccioliCourt Stenographer (uncredited) | Court Stenographer (uncredited) |
