I've read a few books on it, perhaps too many as my recall is imperfect these days and it's all jumbled, but from what I remember in the books Nitti was the boss at the time after Capone, and in none of those books did they ever have it broken down into crews at that point.

But, they are books, I certainly didn't have anyone in the family.

Bill Helmer's book on the Massacre is an exhaustively researched book on it, and there is also a book called "Bloody Valentine" about him and Rolfe, as well as one just called "Assasin" or something. John Binder almost certainly addresses it as well in his book "The Outfit."