Just out of prison, ex-con Ugo Piazza meets his former employer, a psychopathic gangster Rocco who enjoys sick violence and torture. Both the gangsters and the police believe Ugo has hidden $300,000 that should have gone to an American drug syndicate boss. Caliber 9 is the first part in Di Leo's "Milieu" Trilogy of poliziotteschi films. It was followed by "The Italian Connection" (1972) and "The Boss" (1973).
Gastone Moschin
as Ugo Piazza
Barbara Bouchet
as Nelly Bordon
Mario Adorf
as Rocco Musco
Frank Wolff
as Police Commissioner
Luigi Pistilli
as Mercuri
Ivo Garrani
as Don Vincenzo
Lionel Stander
as L'Americano / The Mikado
Philippe Leroy
as Chino
Mario Novelli
as Pasquale Tallarico
Giuseppe Castellano
as Nicola
Salvatore Arico
as Luca
Fernando Cerulli
as Hotel Clerk
