^^^^What Alex just said.

And this isn't a swipe at the Sicilians because I love them. They're a lot like Calabrians in many ways. But the Genovese Family, post Luciano-Genovese, rarely had any use for them. They remain the most powerful and influential family today, yet they actually shy away from making both Italian and Sicilian born members. Look at the member lists if you need proof of that.

Of course there are a few exceptions to that rule---Barney's a big one. But generally speaking, they're just fine with making second and third generation Italian Americans, no matter what part of Italy they're descended from.