Similar movie question

In the late 70's there was a movie that had a neighborhood that was terrorized by a gang that would do a strange hand jive while making sounds with their mouth. There was an old man at the end that made locking wrist cuffs and restrained one of the gang members while the other people beat him. I'm not sure if it was a made for tv movie or a theater release.

"LEAVE THE GUN, TAKE THE CANNOLI."