35. Nick Gentile (1884-1963) Soldier turned FBI Informant.

This guy may have been made in Sicily and actually belonged to a family there. He passed through various mafia-familied cities during his time in the States, as a active criminal and later apparantly as a kind of travelling mafia statesman and consigliere,
setting up and adjudicating meetings and sitdowns.

I dont think he was an actual FBI informant, but he did publish his memoirs in the '60's, and i think it was these that the FBI used as reference.