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arn pate " DONALD DUART MaclEAN, et al i SAC, Bashington Fsela "July 28, 1952 Director, FRI ESPIONAGE © R There ts betng transnittted herewith for your tnforma- tion a copy of a coununtcction received fron the Atoate imergy Comntssion, Fashington, Dy Cay dated July 10, 1951, You wtl2 note that this letter contains tnfornation reflecting in some detail the extent of danage whtch might hove been done through Maclean's poastble defection, by reason of hia knowledge of mattera dealing with atomic energy as gained through his having represented the Sritish imbassy during 1947 and 1948 in matters dealing with the political aspects thereof and through his work on the Combined Development Agency. The above te betng passed on to you for your confidential tnformettone