This film is Damiano Damiani's finest "mafia-film". He directed several movies of the crime-thriller-subgenre, which are all very interesting, but this one is a true masterpiece, with Gian Maria Volonté touchingly convincing as a policeman who uncovers corruption and begins to live in great fear for his life.
Mario Adorf is cool as always as a suspect attorney, and Damiani increases tension perfectly until the riveting climax. The realistic film is also very melancholy in a way, which makes it even more believable.
While Enzo G. Castellari's superb "La Polizia Incrimina, la Legge Assolve" is the crown of the Italian poliziotteschi (police thrillers) of the 1970s, this highly recommended film is the same for the Italian "mafia-film" of that period.