Reuther wrote my office. commenting on the State Department decision and reporting on a conversation with U.N. Secretary General U Thant and U.N. .Under Secretaries Ralph Bunche and Philippe de Seynes in which they indicated that the State _Department action might be a violation of the convention betweenthe United States and the United Nations. He asked that the Committee on Foreign Relations inquire into the denial of a visa to a delegate to a United Nations Conference solely on the ground that he was a Soviet trade union leader. I. therefore wrote Secretary Rogers on June 5. asking him to furnish me with a detailed explanation of the back-" ground and reasons for the decision. Mr.