This is most likely is a power struggle happening in Hamilton. For the longest time the Musitano family enjoyed their power because Vito was alive. Ever since his death and the power struggle in Montreal, the Luppino family being their rivals are trying to take over the area and eliminate them.

I know a lot of people mention that there are 3 families in Hamilton with Pappalia often mentioned, but it's unclear if the Pappalias are a separate independent family, or a Buffalo crew, or simply they don't exist and are just part of the same Luppino family. Remember that the Violi brothers may very well be leading this Pappalia group, and their grandfather on their mother's side is Giacomo Luppino, so it's most likely just two families that exist and are fighting for the city control.