The CIA Book Club: The Best-Kept Secret of the Cold WarFor almost five decades after the Second World War, Europe was divided by the longest and most heavily guarded border on earth. The Iron Curtain, a near impenetrable barrier of wire and wall, tank traps, minefields, watchtowers and men with dogs, stretched for 4,300 miles from the Arctic to the Black Sea. No physical combat would take place along this frontier: the risk of nuclear annihilation was too high for that. Instead, the conflict would be