Find the 2018 Blue Underground Blu-ray rip (titled Corrupt ) or download the 1:51:00 fan restoration. Then, download the user-verified English subtitles from OpenSubtitles. Once you have the right text synchronized to the right cut, you will finally understand why this "copkiller" remains a cult treasure.
(Another common title for the Harvey Keitel/John Lydon version) L'assassino dei poliziotti (Original Italian title) Recommended Subtitle Sources copkiller 1983 subtitles