Read my post above. To reiterate, the lack of a sufficient pool of 100% Sicilians compels the Cosa Nostra to admit non-Sicilian Italians in order to provide it with enough soldiers. But, they have to be Italian, period. For example, I believe that Vito Genovese was Neapolitan - from Naples. Both he and Frank Costello (a Calabrese) were two very talented Italians that the Cosa Nostra could not pass on just because they were not Sicilian. Al Capone was Napolitan also. But, whether or not he was really and truly a Cosa Nostra member is not clear. The Chicago Mob or Outfit has always operated somewhat differently from the other American families.