The Montreal groups were associated with the NYC Bonnano's from the time Joe Bonnano sent Carmine Galante up there to organize, which was post war 45-47ish.
What Galante found was Luigi Greco, a Sicilian expat, leading a loosely affiliated band of Sicilian LCN members, this is who Nic Rizzuto was aligned with, and the Contorni group, Calabrians, but not Ndrina.

It seems Galante was able to bring these groups together, albeit, there was still tension between the two factions, which is what formed the base of the Bonnanos Montreal crew.

To say there was not much interaction between NY and Canada during this period is an inaccuracy. There is the obvious drug supply connection, but also multiple documented accounts of visits between gangsters from both sides, for both business and pleasure, as well as Montreal was where several of the Bonnano guys headed when they went on the lam.

It seems that the Controni faction, through the 50s and 60s accepted this situation and threw their lot in with the Bonnanos whole heartedly, while the Scilian faction, mostly made up off guys who had been made back in Sicily ,felt stifled under this setup.

The question I have, is when Vito was inducted, and other Montreal mobstersliving in Canada but with the obvious clan ties to the old world familys, to which family did he pledge, the Bonnanos or the Scilian?