Tattaglia vouched for Solozzo, as Vito said to Sol before he said "no."
So how do we figure that “Tattaglia vouched for Solozzoâ€
VITO CORLEONE
And what is the interest for the Tattaglia Family?
SOLLOZZO (to Tom)
My compliments.
(then to Don Corleone)
I'll take care of the Tattaglia's, outta my share.[/quote/]
Sol would never have gotten an audience with Vito unless another Don vouched for him. "My compliments" was not Sol admitting that he was trying to hide Tatt's vouching for him, it was his way of was buttering up Tom to reinforce Tom's enthusiasm for the drugs deal.