◆ SpookStack

ORIGIN OF THE CASE Tafermatton wos received by the Federal Bureau of "Investigation in the Summer of 1949 that the secret of the censtructton of the aton bomb had been stolen and turned - suer to @ foretgn power, Tanediate tnvestigatton was undertaken. The tnvestigation resulted tn the tdentification of Entl Jultue Klaus Fuchs, German-bern British atomic sctentiet. Britter intelligence | suthorities were advised. Fuchs was srrested by. the Brittsahk on February 2, 1950, and adattted his involverent tn Sevtet atonte espionage. He did not know the identity of . Ats Anertean contact. The latter was subsequently tdentified through ¢ztensive Bureau investigation as Barry Geld, a Philadelphia chentst. On May 22, 1950, Gold confessed hts espionage acttuity to the FBI. | Investigation of Horry Gold's adatastona led to the identtficattien of David Greengloss, @ United States dray ea- itated man who hod been assigned at Los Alamos, Hew Mexico, tn 1944 and 1945, as ¢ Soviet agent. Gold related he had picked up espionage actertal from Greenglass durtag June, 1945, on _tastructtons of “John,” hia Soviet princtpal. "John™ was sub- * pequently | tdenttfied as Anatolt Yoke lev, ferner Seviet pice- "eonsul ta Hew York City, who left the U. 8. in Decenber, 1946. Iaterrogstion ef Greenglass and his wife, Ruth, resulted in aduisstons of espionage octivity under the tnatructtons of Julius ond Fthel Rosenberg, brother-in-law and aister respec-