I was released by Colorbox (I believe) on UK VHS back in the 80s...
If you're new to Castallari, I would certainly recommend you checking out the following films:
The Big Racket (available on a Region free DVD in the US from Blue Underground)
Street Law (Ditto)
Johnny Hamlet (Koch, Germany, R2 DVD)
Keoma (Argent Films, UK)
I have heard a rumour about a UK company releasing High Crime later on this year. If it does turn up, I say snap it up immediately! It's my favourite Castellari film.