The article above makes the interesting claim the the Gambino crime family began from a core of 150 members, grew to about 500 members by 1976, and had a high rate of intermarriage, such that many were fourth or fifth cousins.

The article also claims that after Carlo's death, his blood relatives were concentrated around Paul Castellano, and the non-blood relatives in a second group around Dellacroce. So instead of the white-collar/blue-collar rift, we have a blood relative/non-blood relative rift.