Yes, Massino was getting really paranoid at that point. "Bonventre" was Joe Bonanno's family name on his mother's side, though I don't know if Cesare was related to him.
Sonny, I assume you've read Anthony Destefano's "King of the Godfathers." It's one of the very few excellent Mob boss bio's. If you haven't, I strongly recommend it.
Ntra la porta tua lu sangu � sparsu, E nun me mporta si ce muoru accisu... E s'iddu muoru e vaju mparadisu Si nun ce truovo a ttia, mancu ce trasu.