They don't have a traditional hierarchy like the New York families have. You could compare their hierarchy more with the Chicago Outfit. Originally, the boss of the Montreal mafia was also a caporegime in the Bonanno family. This was during Vic Cotroni's reign. But in later years this became a symbolic status as neither Vito or Nick Rizzuto were officially caporegimes, yet they were in fact the bosses of the Montreal mafia. Sciascia was officially the caporegime, but in actuality served as the laison between the Bonannos and the Rizzutos and acted as the Montreal representative in the Bonanno family.

This is thought to be the administration around 2000.

Boss: Vito Rizzuto
Consigliere: Paolo Renda, Nick Rizzuto
Streetboss: Francesco Arcadi

And then you have other influential members, like:

Rocco Sollecito
Agostino Cun trera
Lorenzo Giorgiano
Francesco Del Balso
Moreno Gallo
Joe Di Maulo
Tony Mucci
Emanuele Ragusa
Raynald Desjardins

...