Copkiller (1983)
Copkiller or Copkiller (l'assassino dei poliziotti), also known as Corrupt and The Order of Death, is a 1983 Italian crime thriller film directed by Roberto Faenza and starring Harvey Keitel and musician John Lydon, the singer for the bands Sex Pistols and Public Image Ltd.. It is based on Hugh Fleetwood's novel The Order of Death, which was set to be the original title of the production. Fleetwood also adapted and wrote the screenplay with Faenza and Ennio de Concini. The music was composed by Ennio Morricone.
More at Wikipedia.