The feds had their eyes on Gotti already in the 1960s. Read his FBI files in the Vault.

I totally agree with PB what he says in his post above. But the question in this thread is who the better boss was, Castellano or Gotti. In my opinion, Gotti was a disaster for the Gambinos. He lasted for five years only before being sent to prison for life. That´s an extremely short tenure as boss on the street. And he only had himself to blame.