Gian Maria Volonté
Dottore

Florinda Bolkan
Augusta Terzi

Gianni Santuccio
Police Prefect

Orazio Orlando
Biglia

Sergio Tramonti
Antonio Pace

Arturo Dominici
Mangani

Massimo Foschi
Augusta's Husband

Aleka Paizi
Governess

Vittorio Duse
Canes

Pino Patti
Wiretapping Dep. Head

Salvo Randone
Plumber

Giuseppe Aguinaldo Nicastro

Ugo Adinolfi

Giuseppe Terranova

Roberto Bonanni

Calogero Azzaretto
Man Listening the Speech of Dottore (uncredited)

Gianfranco Barra
Interrogation Officer (uncredited)

Aristide Caporale
Man at Police Headquarters (uncredited)

Ettore Geri
Officer Attending the Final Confession (uncredited)

Alfonso Giganti
Policeman (uncredited)

Enrico Marciani
Officer Attending the Final Confession (uncredited)

Enzo Mondino
Officer Attending the Final Confession (uncredited)

Mario Pascucci
Policeman (uncredited)

Fulvio Pellegrino
Policeman Listening the Speech of Dottore (uncredited)

Elio Petri
Policeman Sleeping During Dottore's Address (uncredited)

Alessandro Tedeschi
Man Listening to Speech (uncredited)

Armando Tortorici
Arrested Contestant (uncredited)

Romano Moraschini
Policeman (uncredited)

Ugo Ballester
Officer Attending the Final Confession (uncredited)