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June 19, 1951 PFUSORAL BY SPECIAL VFSSENGER - Wonorable Gorden F. Dean Chatrman Atonic Fnergy Coun: easton iSth & Constitution Avenue, F. Fo Faehington, De Ce _- My dear Ur, Deans There are attached hereto teo coptes of a menorandusn Sealine with the dfaappearance of Donald Duart VacLean end Guy Francie de Voncy Burgess. IF would lftke to adi toe the attached aenorandum and edulise you con*tdenttally that develspucnta prowing out of the tnuestioation af the disappearance of the to tadtvid.ale woke {t hichly prebable that both were Sovtet ea>tonare agente. ¥ would therefore like to request you to prepare for ue a paper showino tn eome detstl] the extent of the damave done through VaclLean representin- the Srittah Enbasay during 2947 ani 1948 on matters Jealtn> with the political aspects ef atonfe energy ani throurh hts work on the Corndined 3evelopnen Agency. fhe above would be ageuntn7? that FacLean was etther a Souvutet acent er has Jefected te the Seviet Union, i