Gian Maria Volonté

Bartolomeo Vanzetti

Riccardo Cucciolla

Nicola Sacco

Cyril Cusack

Frederick Katzmann

Rosanna Fratello

Rosa Sacco

Geoffrey Keen

Judge Webster Thayer

Milo O'Shea

Fred Moore

William Prince

William Thompson

Claude Mann

Eddie

Edward Jewesbury

Alvan T. Fuller

Armenia Balducci

Virginia Vanzetti

Valentino Orfeo

Celestino Madeiros

Pier Giovanni Anchisi

Defense Committee member

Desmond Perry

Lieutenant

John Harvey

Minister Palmer

Felicity Mason

Marisa Fabbri

Mary Splaine

Claudio Sora

Joe Morelli

Maria Grazia Marescalchi

Brini

Giacomo Piperno

Pelser

Sergio Fantoni

Consul Giuseppe Andrower

Sergio Serafini

Giorgio Dolfin

Armando Tortorici

(uncredited)

Mario Ingrassia

Court Officer (uncredited)

Osvaldo Peccioli

Court Stenographer (uncredited)