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te te ee ea Se on Ne A ep coche - : some mole eee me: as =a aly ee ee aD leten Atherton 2 "4 i, ; ad SPT Seek MEP T ep wero eh peeing ean BS 4° —-: “- eS ds re Pie ee ee ” . i t ‘ .- - 5 -* .. : . - bd ° : _ oe - - . . 7 . . . che . ~ ‘os ~~ o™ ot i ia, i ee he oe 2 ie ee i ee ee ee Pe . . J oat, . . . . : . . . * a Bee atte le meee -4 . . _. .- 2 -. vase Be ge et whee wee: . . wore oe Me ee em me ee ee on es eee ee ee ee ee eee” . . — . ee me ares of wot Sater a ees ee Ca - * . - meee a oe eee Te brn yes tee se .- | Ese ome of the. “Snformetion. available to Kacloen tn, 1947-48 as” eS ig classified Top Secret and would ¢ then _bave been of interest . othe Sovie t Union, . Cte tt mreee ere peewee comes Seon . MacLean asa 4a not have access to fissionable material _proéuction -.. ee eens ae . so cata % but, _we have considered the questionaf w whether ‘stockpile wie: ceugtres “ninety a a date could beve deen a ealculated from t the raw pateriale inform ceeaneae soo ” ae betel whe wd 1947-43 2n4 "believe. that Pees a rough nh order of sepnttuls el ee ee estirate of presently existing or prospective. ‘Btscipiie-s of I r ooneianesen « fissionable meterial could be derived : trom that Information, ae eS nee. We have tested this out by calculations from those date, end Swish, . find thet the results would be widely misleading As to our = - . present or prosvective position in ffesionable meterials EL stockoile, Since 1946 + there bes been no exchange of information . .~-u0°": with tue U United Kingdom and Canada concerning fissionable . . _. ee ee material production processes, weapon technology end develope ..--.---. 5. == ment, or stockpiles of fissionable materials and weapons, co 0 The estimates of raw materials supply that were useé in Combined | oe - Policy Conmlttce cplculations p27 T1942 were much under the eng tems Thus . actual supplies received in that period. Subsecu ent t_to nee Magbeen's trénsfer from Washington, the fissionable material _ —_ tees production « ecbedules have been expanded | "considerably ever the-.2 9 -a 5” - eatinéte OF gud schethles for 1988 throveh. 1952 made in 1947 ea a and to which | h Macbean “bed eccess, Therefore, we go not ae ea | |vetieve t thet t the. be information available to Maclean in 1927.48 Wt a te . ae we ep oe we ae Fue Lee would now be of any y appreciable “ald tot the Soviet ‘Vaion - Sateen aa oe. * we { A: rk a: eee on chee wee begause of the changes in the rate and scale « of_the -. ~ United States pro 8 _progran wi which have. _taken - Aken place | in _the Antex. Cs peepee tO vening years. an . 20 Pct ysr FRG tee chery ee ; ra " ’ o =: ral Wy {3 te * 4 cay We will appreciate any further information. soncoratcg' tachoun | which will help us in further Accessing possible danage to our r program, . Sincerely yours, * OS ad TE t " UNITED STATES ATOMIC EMERGY COMMISSION t [ ne a ee ee ee . , , + oe ES : zou - * Ronoreble J, Edg#r Hoover, Director meee Federal Bureeu of Investigetion 1c U. 8S. Department of Justice Weshincton, dD. C.