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. materials frou foreign sources by the Combined Development 4 ‘ Tn: his capacity as UE Secretary ofthe CPC he took part in the - ; aa... aes eourists of Doty core ees BO. han wf 12 ~ univeo stares ATOMIC ENERGY COMMISSION WASHINGTON .B.G 0 ~* Reference is nate to our. letter pnd sumnery-of information | s ane 39.3951. ‘Dongld_ DoartHachean_ and ‘de"Kone rgoss. You asked that we prepare a ” p_sote detail the extent of. damaze done through and through his work on the Combined ‘Development Agency. The - above would be assuming that MacLean was either a Soviet agent . or has defected to the Soviet Union. bene tea in. Fed 1947, MacLean was_designated_by.his Government to. Geechtion concerned _with atomic energy matters, “composed of representatives of the United States, the United Kington end” ~~ Canada. The AD’ representation on the Combined Policy Committee Degan in September 1947. Mac! es involved the handling with his Canadian and American terparts of those atomic energy matters of concern to hi Government which come under the purview of the { Combined. 3 “Pol icy. Committ In connection wit! these duties, MacLean had opportunity to have access to the information sheared by the several countries in the fields of “" "TO patents, declassification matters, and the research and de’ : ~ ment relating to the procurement and beneficiation BK FDDITE negotiations which 3 regulted in the Modus Vivendi which governs, the atomic ener, / Felations among the. th: ) three ‘governments since 9he. ng the course of those Begotiations, MacLean -- nccoss to information relating to the estimates made at that tine of pra sinsly available fo the three _governtents through | within the the three | scermeentee during ‘that periods end the éefini- . tion of aclentific areas inwhich the three governments deened . echnical cooperation could be accomplished with mutaal Denefit. _ DR,