I don't think it's based on the gambinos because of tonis conversation with cusamano about john gotti.
I think I know what your referring too. Tony's playing golf with Cusomano and some of his colleagues. Cusosmano or one of his friends asked if he ever met "John Gotti," which Tony responded yeah he did. Someone correct me if I'm wrong I followed the series but can't recall everything from it.
Random Poster:"I'm sorry I didn't go to an Ivy-league school like you"
"Ah I actually I didn't. It's a nickname the feds gave the Genovese Family."
