From Raab's "Five Families":

"(Anthony) Accetturo's unexpected contribution was historical data about the Mafia's origins in New Jersey that he had absorbed from conversations with mafiosi old-timers. At the creation of the American Mafia organization in 1931, Lucky Luciano had permitted the formation of only one independent New Jersey borgata, a small clan in Elizabeth that became known as the DeCavalcante family. Leaders of more powerful crews in the Newark area were offered a one-time opportunity to join one of the five newly defined New York families. Believing they would have little chance of upward mobility in the largest New York family, which Luciano controlled, most Newark capos aligned themselves with the four other borgatas. Their decisions in 1931 established the strong and lasting presence of all the five major families in New Jersey."