Didn't Gotti summon Gaggi once, and Gaggi declined to meet him, and Gotti demanded he show up or else? Something like that. I remember hearing about Gotti throwing his weight around with him, can't remember where.
Can what Gravano said re: Gaggi and Castellano really be trusted? He's pretty liberal with the truth.
I invoke my right under the 5th amendment of the United States constitution and decline to answer the question.
