It seems that when he was a youngster, Roselli (Sacco) arrived in Chicago and story goes that he received cash for his travel to the west coast personally from Ricca, who in turn possibly also helped Roselli to establish himself in the Los Angeles family, in which during the years he received an official membership. Also during the same period Roselli had constant collaboration with the Fischettis. So yeah he was somehow Chicago's guy on the west coast or the best connection to the LA crime fam. When Giancana became the boss in 1957, it seems that Roselli also transferred his membership at the same time, from the LA fam to the Chicago Outfit.