Didn't Gravano have a massive grudge against Di Bono? Isn't that the guy he physically threatened in front of Castellano during a sit down?

I thought it was Gravano who instigated his murder.

Fiala I believe he personally pulled the trigger on. Di Bernardo murdered by Milito in Gravano's presence IIRC.

I invoke my right under the 5th amendment of the United States constitution and decline to answer the question.