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_ UNITED STATES < ATOMIC ENERGY COMMISSION . WASHINGTON BS, 0. on “WLI wi a ana: Dear Mr. Hoover: Reference is male to your letter pnd summery, , f information \ dated June #25 ng Donald Duart’ Lean and - Guy Francia ‘gens. You geked that we prepare a wae paper showing in adie, detail the extent. of. damage done -t Sot Maclean representing the British Embassy during 1947 and 1948 . on nh Batters Mealing with the political aspects of atomic energy whe and through his work on the Combined Development Agency. ‘The bo, above would be assuming that MacLean was either a Soviet F agent on . or has defected to the Soviet Union. . cervaee -ar In Februar Feb: 1947, MacLean was. _Aestgnated by bie Covernment to, Committee concerned with atomic energy matters, composed of representatives of the United States, the United Kingdon ena*~ Canada. The AC ae guy Mastek on the Combined Policy Committee Machear ties involved the handling ©: unterparte. 6 of Web 6 atomic” act_ae the United Kingdom's Secretary of the Combined Poliey | these duties, Mackean had opportunity” to have access to the information shered by the several countries in the fields of “~~ patents, declaseification matters, and the research andi de 1 [ment relating to the procurement and deneficiation SKERDITE materials from foreign sources by the Combined Development vu In‘his cs ‘capecity_a as_UK Secretary ofthe CPC he took part in the negotiations which remlted in the Modus Vivendi which governs the atomic em Felations among the_ ‘three governments since Jamary, 1988 Slee Daring the course of those negotiations, MacLean -* haé access to information relating to the estimates made at that --- yeh time of oxe sipply available.to the threa_goveranents thi 1952: requirements of uraninm for the atomic energy progrems thin the thr: governments during | that period; and the defini- . 2 don of scientific areas inwhich the three governments deemed echnical cooperation could be accomplished with mitual benefit. oe . PORE 9 St INDEXED. oe re Sara