Tomas Milian as Vincenzo Marazzi 'Il Gobbo' / Sergio Marazzi 'Er Monnezza'

Pino Colizzi as Commissario Sarti

Isa Danieli as Maria - prostitute

Mario Piave as Commissario Valenzi

Sal Borgese as Milo Dragovic 'Albanese'

Luciano Catenacci as Adalberto Maria Perrone

Solvi Stübing as Marika Engver - embassy clerk

Guido Leontini as Mario Di Gennaro - 'Sogliola'

Francesco D'Adda as The Bespectacled Psychiatrist

Fulvio Mingozzi as Commissioner Mingozzi

Carlo Gaddi as Faina' - Gobbos friend

Alessandra Cardini as

Livio Galassi as Giggi - Gobbo's friend

Pierangelo Civera as Agente Romeo Esposito

Nello Pazzafini as Carmine Ciacci

Franco Odoardi as The Chief Psychiatrist

Salvatore Billa as Hitman

Tom Felleghy as Questore

Alba Maiolini as Borgatara

Riccardo Petrazzi as Chauffeur

Rosario Borelli as Romolo

Anna Manduchi as Nightclub Customer (uncredited)

Quinto Gambi as Arrested Criminal (uncredited)

Fortunato Arena as

Pietro Innocenzi as Benito Giua (uncredited)

Alfredo Quadrelli as (uncredited)