Check out Al D'Arco's book. Goes into a lot of mob history. According to what D'Arco learned, there used to be one big mob in Brooklyn and one of the original guys in it was called Turrido Curiale. He became a captain in the Luchese family, presumably because he had mutual interests with Tommy Luchese in the garment business. He made a guy called Joe Schiavo who was Al D'Arco's relative. When Curiale decided to step down, he offered Schiavo the captain spot. But Schiavo didn't want it and told him to give it to Paul Vario, who Schiavo had recruited and sponsored into the family.