As far as American lcn no one on the street (post 2000) really has a considerably higher death toll over someone else in my opinion. All the guys who had high counts have been either dead or in jail for a rather long time now. Although you do have guys out on the street who have gotten away with murder but since 2000 it's been few and far in between, 1-3 murders a year max. I think whichever clan in Canada that's been shooting up the Rizzuto's would be the frontrunner in that category.