Interesting character actor.
For some reason when I spotted him in THE NEW YORK RIPPER, and then later saw the same guy in both VIGILANTE and SERPICO, I got obsessed with figuring out who he was and what his story was. I wrote his bio on TMDB (The Movie Database - not IMDB) if anyone is interested. https://www.themoviedb.org/person/1325672-sal-carollo
Seems like he's a similar character to Jay Julien or another character named Robert E. Warner (who I know very little about) in that they were go-betweens for Italian productions which filmed in the United States and got them access to a lot of American actors to be in the productions... every now and then having on-camera roles in the movies themselves.