Gian Maria Volonté
Bartolomeo Vanzetti
Riccardo Cucciolla
Nicola Sacco
Cyril Cusack
Frederick Katzmann
Rosanna Fratello
Rosa Sacco
Geoffrey Keen
Judge Webster Thayer
William Prince
William Thompson
Edward Jewesbury
Alvan T. Fuller
Armenia Balducci
Virginia Vanzetti
Valentino Orfeo
Celestino Madeiros
Pier Giovanni Anchisi
Defense Committee member
John Harvey
Minister Palmer
Marisa Fabbri
Mary Splaine
Maria Grazia Marescalchi
Brini
Sergio Fantoni
Consul Giuseppe Andrower
Armando Tortorici
(uncredited)
Mario Ingrassia
Court Officer (uncredited)
Osvaldo Peccioli
Court Stenographer (uncredited)