A set of three influential 1970s Italian poliziotteschi (crime) films directed by Fernando Di Leo: Caliber 9 (1972), The Italian Connection (1972), and The Boss (1973).
The The Milieu Trilogy collection gathers 3 films released across 1972–1973. Below is every entry in release order, each linking through to its cast, crew and full details in LDB — the Loaded Database.