Pariah: The Lives and Deaths of Sonny Liston
Sonny Liston - La vera storia (original)
Starring Sven Ruygrok, D. David Morin, Sonny Liston, Mike Tyson, Jerry Izenberg, Floyd Patterson, Gene Kilroy, Muhammad Ali, Chuck Wepner
It's a documentary and biography movie, and has a rating of 7.3 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Italy.