Top10 at moment:
Di Leo: Manhunt
Lenzi: Violent Naples
Deodato: Live Like a Cop, Die Like a Man
Girolami: Special Cop in Action
Sollima: Revolver
Lenzi: Almost Human
Di Leo: Milano Calibre 9
Lenzi: The Cynic, the Rat and the Fist
Castellari: Big Racket
Sollima: Violent City
By the way, do you consider Leone's Once upon a time in America as a crime flick? Great film but maybe not that kind of film we are looking for here.