I can only assume the 4 groups refers to the Locali in Ontario and the 17 branches or sub groups are the Ndrine. There use to be other Locali like the Sant'Onofrio Gioiosa Ionica and Marina di Gioiosa Ionica Locali but the Sidernese expelled the others hence there only being 4 now. I think that isn't right though because there were said to be 4 Locali in the GTA from Siderno plus another in Thunder Bay from Siderno. Ottawa and London have been mentioned before but like you Vitocahill I don't know anything about any activity there.