C.I.A. Chief Finds Gorbachev A Mixed Blessing for Agency
LEAD: William H. Webster, the Director of Central Intelligence, says that Mikhail S. Gorbachev poses a challenging paradox for the thousands of officials who collect and analyze information on the Soviet Union, traditionally viewed as the most difficult target in the espionage business, The Soviet leader's policies of openness have given the Central Intelligence Agency unparalleled opportunities to gather intelligence by both open and clandestine means.