Guenter Guillaume, an agent for East Germany's Stasi who was unmasked among the closest aides of West German Chancellor Willy Brandt, was exchanged for captured Western agents. He had served eight years of a 13-year jail sentence before he was handed over to East Germany in 1981. The Guillaume and Powers/Abel exchanges were handled by East German spy-swap lawyer Wolfgang Vogel. He also negotiated the 1986 exchange at the Glienicke Bridge of Soviet Jewish dissident Anatoly Shcharansky (now Natan Sharansky) for Communist spies jailed in the West. In all, Vogel brokered the exchange of more than 150 spies. __