Charles Bronson
Role: Joe Valachi
Lino Ventura
Role: Vito Genovese
Jill Ireland
Role: Maria Reina Valachi
Walter Chiari
Role: Dominick Petrilli, aka "Gap"
Joseph Wiseman
Role: Salvatore Maranzano
Gerald S. O'Loughlin
Role: Ryan, federal agent
Amedeo Nazzari
Role: Gaetano Reina
Fausto Tozzi
Role: Albert Anastasia
Pupella Maggio
Role: Letizia Reina
Angelo Infanti
Role: Lucky Luciano
Guido Leontini
Role: Tony Bender
María Baxa
Role: Donna Petrillo
Mario Pilar
Role: Salierno
Franco Borelli
Role: Buster
Alessandro Sperli
Role: Giuseppe 'Joe the Boss' Masseria
Natasha Chevelev
Role: Jane
Anthony Dawson
Role: Federal Investigator
John Alarimo
Role: Steven Ferrigno (uncredited)
Calogero Azzaretto
Role: Man of the clan (uncredited)
Joe Don Baker
Role: Irish member of Valachi gang (uncredited)
Steve Belloise
Role: Winnie (uncredited)
Angelo Boscariol
Role: Gangster (uncredited)
Nestore Cavaricci
Role: Prisoner with Valachi (uncredited)
Giacomo De Michelis
Role: Augie (uncredited)
Bruno Di Luia
Role: Luciano's Henchman (uncredited)
Arny Freeman
Role: Warden (uncredited)
Alfonso Giganti
Role: Wedding party guest (uncredited)
Ron Gilbert
Role: Prison Guard (uncredited)
Frank Gio
Role: Frank (uncredited)
Syl Lamont
Role: Commander of Fort Monmouth (uncredited)
Imelde Marani
Role: Donna Petrillo's friend (uncredited)
Isabelle Marchall
Role: Mary-Lou (uncredited)
Jason McCallum
Role: Donald Valachi (uncredited)
Sabine Sun
Role: Jane (uncredited)
Robert Trout
Role: Self (uncredited)
Franco Ressel
Role: (uncredited)
Richard Dunne
Role: Judge (uncredited)