Sollozo wasn't in a Family. He was allied with the Tatagglias. Where would he find an honest negotiator? He was tyring to settle his personal fued with the Corleone family, and a negotiator wouldn't really make sense.
"Today I settled all family business, so don't tell me you're innocent, Carlo-" Michael Corleone
"I punks ed i gruppi ed i rappers moderni hanno avuti timore migliore il sole aumentante di questa cosa di il nostro."
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