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e200 wom 4 OF = sm STa fES GOVE: RNMENT; ro a Mr. Toleon fo - cz fom et 5. BL Htohole a ‘ suaject: DONALD D, MAC LEAN Villtam Borden, executive dtrector of the Jotat Con- mittee on Atomic Energy, advised me confidentially that tn the early days of the Mmhattan Engineering District there wea combined poltcy committee represented by tndividuals designated _ by the British, Conodian and U. 8. governnents. This comnittee had the reaponatbility of ftzing allocattons of urantur ores, going tnto the joint acttuities of the Manhattan Engineering | . tstrict and subsequently of passing upon and handling the ez- a ise of technical tnfornatton, The combined poltcy comatttee |=: £2 had a secretartat composed of one representative of each of the — three countries, From April 1947 until July 1948, MacLean wos the British member of the secretariat. gir 2 4a such, Maclean had detailed snformation on the ollocotion af ores, Gtonte prc n eof tegh- iy ava gonterence tn 104! le 80 attended the first declaaaifscatton conference tn 1947 o8 a visitor, white the British delegate was . Br. Yiaus Fucha, ” Se et eee nt ee oe Borden told me that the Joint Committee had requested | AEC to prepare an estimate of how much knowledge MacLean covld “4 [Ihave hed. He eleo-told me senfidentially that ene acientist ; tetinately essoctated with the atonic project has stated that tf | Melean were @ spy during the days when he wos connected pita the secretartat he could Mave Aad access to considerable ta- Sormatton; however, the matter ta now probleastical a8 to how ~: vat gern MacLean had tnasmuch a8 he was not a technical man. - The thought occurs tome thot tt aight be well_for our Itatson to make @ routine {nguiry_ot_the Atomic Energy — OnSOr ony snfornation they might have of any atoxte ‘iF tnformation which wae made avatiadle to Maclean. . _. 2 thanked Borden for the taformatto t