It has long been a rule in the Mafia that a boss could only be killed with the approval of a majority of the Commission. Indeed, Gotti's planned hit would have been the first unsanctioned hit on a boss since Frank Costello was nearly killed in 1957. Gotti knew that it would be too risky to solicit support from the other four bosses, since they had longstanding ties to Castellano. To get around this, he got the support of several important figures of his generation in the Lucchese, Colombo and Bonanno families. He did not consider approaching the Genovese family; Castellano's ties with Genovese boss Vincent "Chin" Gigante were so close that any overture to a Genovese soldier would have been a tipoff. However, Gotti could also count on the complicity of Gambino "consigliere" Joseph N. Gallo.