For years, among members of the U.S. Intelligence community, there was an undeserved smugness that highly placed Soviet Intelligence operatives such the British spies Guy Burgess, Donald Maclean, and Harold "Kim" Philby could never happen here in the United States. Despite the Hiss and Rosenberg cases, Americans were thought superior to "that sort of thing." Besides, our security procedures and regulations were thought to be airtight. The British,...