Gian Maria Volonté as M.

Marcello Mastroianni as Don Gaetano

Mariangela Melato as Giacinta

Ciccio Ingrassia as Voltrano

Franco Citti as Autista di M.

Cesare Gelli as Arras

Michel Piccoli as Lui

Renato Salvatori as Dr. Scalambri

Tino Scotti as Il cuoco

Adriano Amidei Migliano as Capra-Profiri

Giancarlo Badessi as Ventre

Marion Bartoli as Primogenito Lombo

Nito Costa as Prete giovane

Guerrino Crivello as Speaker TV

Marcella Di Falco as Saccà

Giulio Donnini as Bastante

Aldo Farina as Restrero

Giuseppe Leone as Martellini

Renato Malavasi as Michelozzi

Riccardo Mangano as Cardinal Beccarisi

Piero Mazzinghi as Caprarozza

Lino Murolo as Mozio

Piero Nuti as Schiavò

Loris Pereira Lopez as Lombo sr.

Riccardo Satta as Lomazzo

Luigi Uzzo as Aldo Lombo

Luigi Zerbinati as Caudo