He was involved in the organization's battle with French-Canadian gangster Richard "Le Chat" Blass and his small band of followers. One day in October 1968, Di Maulo and Claude Faber, Francesco "The Big Guy" Cotroni's brother-in-law, opened fire on Blass as he and Claude Ménard drove into a Saint-Michel garage. Blass was shot once in the back of the head and twice in the back. Blass survived but refused to identify his attackers to police.