◆ SpookStack

claneified Top Secret an and would the to the Sovd det t Union. . Yecbean 4 ana 44 not bave.access to. fisetonable material protuct . date > but _we have _consigere tion af wheth: date could he: calcu the raw ation av available to Mir to Ha 1947-~8_ena _belieye.t ugh o: order of 7 egtirate of presently existing or prospec ective stoc ates of | 2 fissionable meterial « ‘ould be te ‘ived from that” Information, “~~ wee We have tested thie out by calculations from those date, nA . find that the results would de widely misleading As to our . present or iprospective p ‘position - ‘Sn. ff{seionable meterials stockoile. Since 1946 there bes been no exchange of information with the United Tingdom and Canada concerning fissionable | material production processes, weapon technology end develop- ..- ment, or stockpiles of fissionable materiale and weapons, (Be of the. information | available to Machoen 1 fin, 1947-48 yas” a The estimates of raw materials supply r that 1 were used in Combined _ : Policy | tear ittee Ce ee or ONE ER e much under the 8 Subsecuent | ‘to ter “oy and to “which ¥ ¥achean believe “thet t et the 4 “informat would now be ) be of an f any appr because of the. he changes | “therefore, 1 2 mode. SP a, bie to. "aclean in gees at oe . United States 8 program wh which a ken - — 5 vening | years. a - a . o 7 ~~ a We will appreciate any further information concerning MacLean oe ee j . . which will help us in further * sencasing possible damage to nee } 4 our program, i Ere - . : . Sincerely yours, 4 | _ ~ URITED STATES ATOMIC ENERGY COMMISSION T FRonoreble J. Edger Hoover, Director see Federsl Bureeu of Investigetion ci a U. S. Department of Justice Washington, D.C.