Timothy Gatton Ash's The File is an account of a crushing discovery the author made after the fall of the Berlin Wall. A significant number of Garton Ash's best "friends" from his time as a graduate student in Berlin in the early 1980s turned out to have been secret-police informants for East Germany's Ministerium fur Staatssicherheit, the notorious Stasi. It's a strange and haunting book, but don't judge it by its cover -- certainly not by its back cover, where the fatuous Arthur Miller plugs it as "a kind of meditation on Garton Ash's personal experience with the Stasi, the dreaded secret police organ of the East German regime. No population was as closely watched for signs of dissidence, although Hoover's FBI came fairly close at times."
Still more proof, if any were necessary, that the Golden Rule of fellow- traveling anti-anti-communism is, It Takes One To Know One. "Attention must finally be paid," runs the famous line from Death of a Salesman. Arthur, we're paying attention: You're a com-symp.