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1 1n.1947-48 was”: of interest... cYausified Top Secret and would ti Sovie t Union, . - Te of the "information. availabl oe extirate of presently y_wxisting or ro spec apline of > fisslonable peterial could be Cerived trom that Information, = wo. We have tested this out by calculations from those data, eal — : find thet the results would be widely misleading As to our = - present or prospective, position Jn t{asionable meterials _ stockoile, Since 1946" there hes been no exchange of information with tue U United Tingdom and Canada concerning fissionable . material production processes, weapon technology and develop~ . went, or stockpiles of fissionable materials and weepons. fiat] i The estimates of raw materials supply tha re used in Combined - Policy Conmlttce cploplations” 6TIO“7 vere auch “under. the ceived in, that period, Subsecu ent to shingto! e fiseionable material gs have been exp siderably over the - aheeiles for 1948 throvgh 1952 made in 1947 ‘Therefore, we do not =; ] s 3 program wh whi a vening years. : which will help us in further Assessing possible danage to We will appreciate any further information, concerning MacLean RS our r program, eal , Sincerely yours, « ~~ UNITED STATES ATOMIC EXERGY COMMISSION Ronoreble J, Edger Hoover, Director teemeen oe Federal Bureeu of Investigetion 2. eo U. S. Department of Justice Weshinston, D.C.