Investigation of a Citizen Above Suspicion

Gian Maria Volonté

Dottore

Florinda Bolkan

Augusta Terzi

Gianni Santuccio

Police Prefect

Orazio Orlando

Biglia

Sergio Tramonti

Antonio Pace

Arturo Dominici

Mangani

Aldo Rendine

Nicola Panunzio

Massimo Foschi

Augusta's Husband

Αλέκα Παΐζη

Governess

Vittorio Duse

Canes

Pino Patti

Wiretapping Dep. Head

Salvo Randone

Plumber

Fulvio Grimaldi

Patanè

Giuseppe Aguinaldo Nicastro

Filippo De Gara

Ugo Adinolfi

Franco Marletta

Giacomo Bellini

Giuseppe Terranova

Vincenzo Falanga

Roberto Bonanni

Guido Buzzelli

Gino Usai

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)

Franco Magno

Officer Attending the Final Confession (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)

Mario Silvestri

Officer Attending the Final Confession (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)