MIchael Silotro was the brother of an American mobster who replaced what Outfit member in Las Vegas?
Michael Spilotro: Michael Peter "Micky" Spilotro (September 12, 1944 – June 14, 1986) was the brother of Anthony "Tony the Ant" Spilotro and was an associate of the Chicago organized crime organization referred to as "The Outfit". Anthony Spilotro:  Spilotro replaced Outfit member Marshall Caifano in Las Vegas.
Marshall Caifano