Kuklinski was sentenced for only 5 murders but he was active from the 50s, he love to kill and in the 50s-60s the mobster was more trigger happy than today so yes he killed over 100 people,for sure was hired by the mob but he don't killed galante or castellano (because the two hits was a family things) maybe was paid by gravano for kill pete calabro. I read the book on kuklinski,he was an interesting man,he beat his wife but not his children and accepted to plead guilty of the 5 homicides, to don't suffer his family because of the trial and give the divorce to his wife even if she didn't want to divorce.