I think the 750 number is made men and active connected guys and doesn't include guys the Gambinos just do business with. That's just my guess, though.

That's just one confusing thing about the article. It says the Gambinos are the largest La Cosa Nostra organization, but everyone knows that it's the Genoveses. Maybe just trying to make the story more interesting? As Vinny pointed out, they go Dom's age wrong. And why would Dom be elected boss only to give up the power 2 years later?

"I die outside; I die in jail. It don't matter to me," -John Franzese