If I am not mistaken wasn't Carmine Verduci part of the Coluccio clan. If so, it would make sense that he would have a relationship with Montreal. In the book buisiness or blood, when Vito came out of jail, Vito was unclear how things stood with Bruzzese and that his son-in-law Antonio Coluccio was keen on attempting to push into Montreal.Their relations may have been strained at that point.