Sonny Black, Massino would not have to inform the other families about him killing one of his own capo's. He would have to inform a few capo's in his family that were loyal to him so it would not destabilize his position as boss.

"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