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og ow» Ur, D. H. Ladd SECRET we a —damary 24, 1951 og . bl | CLASSIFIED BY ro ) - DECLASSIFY i) ea a _Rer Rudolph Emmet Peierls... « Reference ie nade to your nozoren oli ‘Mes Si : & revien of our files bes been made to locate information econeerning Feierls which aight be of sasistencse to you in assessing Peierls as a security rick. 190 -By HIS During the investigation of Klaus Fuchs, it vas developed | that Peierls was considered by fellow auployees at Los Alamos te have been one of the clesest, if not the closest, associates of Fucks fron beth the professional and séeinl standpoint, It 46 neted, of course, that Pelerle wos the senior member of the British Group at Les Alaws and that Peierls end Fuchs had been closely associated in their vork prior to that time, in Kew York and Great Britain, aa: fellow employee at leg Alans, advised during UC snervion toteemntne that he had been first introduced te Fuchs by Peierls, the head of the British Mission at Los Alamos. Ke said that Peierls endeavored to assist ell Britich eientiets at Loe Alamos and had made it a particular point to entertain Fuchs because of Fuchs! apparent loneliness. He said that ira. Pelerla, he referred te as *Negfir Poheris," had made it a habit to look after all ef the younger nen, The Felerises had boasted, according te in Eegiand hed spent one evening in their home, and t international visitors to the Pelorlees’ neighborhood, he also was 4 guest of the Pelerlees in Desesber, 1948, when . Bagiand on a vavation trip and te eo. itish selentists with whes roi hed been associated at Lea Alamos ecalled that during this wc__ Visit, the Pelerises had given a cooktail party attanded by. wost of the cree British scientists from Harwell, inelading fuehs, (65-58805-446) said that Visited ‘ ALL INFORMATION CONTAINED HEREIN IS UNCLASCIIED EXCEPT WHERE SHOWN GTS ERWASE ORIGINAL COPY FILED IN 6