Mirra was one of the most despised guys around. His colleagues were literally waiting for a solid reason and opportunity to have him whacked. Even a loony like Scarpa was well liked and praised for his sense of humor around fellow mobsters. That surely says something about Mirra.

Dunno if he's obscure enough to apply, but Anthony Indelicato didn't get the "whack whack" nickname for nothing.

Pitera isn't really discussed a whole lot either because frankly people mostly connect his name with his (by now) official serial killer status and tend to forget that he was actually a Bonanno member at the same time. Probably one of the most demented fucks ever connected to the Mob.