I shouldn't really say "split," I should say defunct.

"and the Canadian crew as dead as charity since the assassination of John “Johnny Pops” Papaglia in 1997." Critically acclaimed Niagara Falls Reporter Mike Hudson, who is an expert on the Buffalo mob.

I'm sure you know all about Papalia's death by the hands of Ang Musitano and his crew, as well as the death of Papalia's number-two Carmen Barillaro on the hands of Musitano's crew that same year. You can't tell me there was anything viable Canadian structure left after the death of those two, and if there was then the powerful Musitanos would have dismantled that the same way they dismantled Papalia and Barillaro.