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. I | > 4 > oe LP a 7 ~ . : : i . . me eae we. wt ea a ne ee Pe ee te ale Salen cet ane, SB -: eoeg't) TE, Tea 5 ~ woe ‘ (Osis TRE ky SMe ae 2 Fee RE ES oy c- MN: ’ ware ewe ee ~ - ttt mn mabemniiateds rete weet See. “_ am... doc? Nat “eoutists. cs te r _ ts opm tte - Ho. --f-- wf ~ £4.- Copics, Series - eas ie is UNITED STATES — OT ise TET metas Rees eG = ATOMIC ENERGY COMMISSION. “oo hae er i . oe cae eee ete rat ene Vb ae . Raclatiatell “Ave ee « ad : = PTT een ee ny tee ee ne eee eee ead ~ —— er ree ae an an: ee - See en ree ee eet! . . —_— en rd ~ - . 7 oe .. + . ~~ 7~ bal wee eae - . Sodeeddiemiettenteeld .- Dear ts. Boover: —more + — a me ome. mene = Reference is male to Four. letter and eummry,-of informtion | . tds (19515 J oncerning _Dong1d_ Duart-HacLean and Ce . - Guy Francis fone, Seek. Tou, asked that we prepare a : wee paper showing in some detail the -extent of. damaze dons through | _ + MacLean representing the British txbdassy during 1947 and 1948 on “matters. dealing with the political aspects of atomic energy wee and through his vork on the Combined Development Agency. The ne me, above wonld be assuming that MacLean was either e Soviet agent ; : ane . oF has defected to the Soviet Union. - ero teuiatoes es ov In February 1947, Macbean was_designated_by. his Government to; a wea os Lee act as the United Kingdom's Secretary_of the Combined Policy _ res coe Committee concerned with atomic energy matters, composed of aman | _ - representatives of the United States, the United Kington ana * — oe na . -| Canada. The ADO representation on the Combined Policy, Committee ae .. | ; “7+ +) Degen in September 1947. Mackean's duties involved the handling *~ en we with his Canadian a and American counterparts of thosé atomic et wo, Po peo energy “matters of ¢ concern to his Government which come under; ee mid “s-e2--. ” the purview of the Combined Policy Gommittes. In connection with * se pet tna ee eee _- , these duties, MacLean had opportunity to have access to the = 9 = --==">- wey ee information shered by the several countries in the fields of ““ “TT TC; Sooo. fssrs Geclassification matters, ani the research and de oe — ‘% , [ment relating to the procurement and beneficlation BX FRDITE aCRaING. a . -Peveriens fron foreign sources dy the Combined Developnent LEON P - a ae ‘Tn his capacity as UE Secretary. of the cre he tock part in the TAD mere ppeckiations_yhick resulted in the Modus Nivendi which governs, nn ie ms th e_atonic ¢ energy Felations ationg the three governments since ~~. |: - “4 __ Jpmiary, 1948. ring the course of these negotiations, MacLean = -*- 1+<~--. ; ~: 0 had access to information relating to the estimates made at that -——— | - wet time of ore supply avallable_to_the threa_governtents through ©. J. S-4 2 1952:_requirements of wraninm for the atomic energy programs a fo ee yithin the three governments during that period; and the defini- a AM soem fon of scientific areas inwhich the three governments deemed °c. - wea teee ne. echnical cooperation could be accomplished with mutual Donefit. tityla ten : a . a - - * . RFCORDEN . ot wi / - A ind - F . SPV pe INDEXED . “82 |