Caspar Weinberger called it "the worst spy case of the century." As Secretary of Defense in the spring of 1987, he was confronted with evidence that Marine guards at the U.S. embassy in Moscow had not only "fraternized" with Soviet women but also allowed KGB agents to break into the inner sanctum of the embassy -- the code room, from which sensitive messages are sent to Washington.
There on Weinberger's desk was a confession by Corporal Arnold Bracy, a 21- year-old Marine who had been stationed in Moscow the previous year. Bracy's statement convinced virtually the entire Government that there had...