I can add that Rosselli was the Las Vegas guy before Caifano, and Rocco DeGrazia had more going on earlier but had some of his power taken away and given to Battaglia. Although Ferraro wasn't an official underboss, he seems to have operated like one. He not only was direct to the bosses but gave directives to other made guys. He was one of the political guys and was very close to Hump. Most of Demaris's info came from the FBI, the Chicago Crime Commission, various Senate hearings and newspaper articles.