A man with multiple aliases used the name of the famed Astor family to dupe a Mexican billionaire out of around $450 million in a bogus stock-backed loan scheme, according to a newly unsealed U.S. indictment and other court records. Vladimir Sklarov, 63, also known as Gregory Mitchell and Mark Simon Bentley, set up a sham company, Astor Asset Group, that purported to be a legitimate and experienced loan provider that was connected to the Astors, federal prosecutors said. The storied New York