State Department refused permission for two individuals accredited at the United Nations to travel to Washington with the World Peace Council group. These were the Vietnamese Ambassador to the U.N.. Dinh Thi Binh. who shortly afterwards was expelled from the United States because of his central role in an espionage and agent of influence network operated by David Truong and Zedhi Terzi. the chief of the Palestine Liberation Organizations U.N. observer group. However. no attempt was made to deny the group U.S. visas. WPC 197576 Disarmament Conferences During 1975. the WPC held several meetings to prepare for an "International Forum to End the Arms Race and for Detente." The Forum was held in York. England. in December.