@Njein
There was always gonna be a beef between Joe Bonanno and Gambino guys. Big Paul possibly had issues with Bonanno in Brooklyn via the food industry or garments. Bonanno's presence in the mob caused issues (finacially and diplomatically) for many people and his removal certainly advanced many guys including Paul Castellano. on a side note, Paul was too busy screwing his maid to remember what was going on in the mob