The Gambinos.
Vincent Mangano-Boss
Phil Mangano-Consiglieri
Frank Scalise-Underboss
Albert Anastasia-Boss
Paul Castellano-Boss
Tommy Bilotti-Underboss
Frank DiCicco-Underboss
Frank Cali- Done by a nut but was still killed

If we go back before the 5 families were formed, we can positively identify two more leaders killed, with a possible 5 others in administration positions during that time who were killed.

"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