For the most part, their top guys like Gambino, Gravano, Castellano, Dellacroce and even Gotti kept their hands out of it.
As per Gaspipe Casso, Gravano was one his biggest customers in his drug trafficking business. He also ran a huge ecstasy ring in Arizona, after he left the mob. On the stand, however, Sammy said he didn't deal in drugs.
Also, I have my doubts about Gotti. His brother, Gene, and his best friend, Angelo Ruggiero were involved with drugs. Could it really be that it was all around John, but he didn't get involved with this lucrative racket?