It would be between Mickey Cohen and Angelo Governale for me. Governale is said to have made a lot of the Matranga loyalist and allies to disappear or left to bleed out in the streets during the Ardizzone and Matranga war.

"I have this Nightmare. I'm on 5th avenue watching the St. Patrick's Day parade and I have a coronary and nine thousand cops march happily over my body." Chief Sidney Green