umberto lenzi napoli violenta be a first class cop movie that really shock me . it excite and really memorable with some nasty bit of violence ( include a fence post impalement and bowl ball facial ) . maurizio merli be great a a veteran cop name betti . he set out to clean up a protection racket run by the commandant ( barry sullivan ) . along the way and betti befriend a little boy whose father be murder by the criminal . since merli pass away in 1989 and violent protection attain almost a cult status in some place . there be some great car chase and plenty of excite gun play . so if youre a fan of italian crime genre give this one a look . highly recommended .