Mar 14, 1951 #ColdWar NYT Accounts of an underground spy escape route using four foreign countries, and of the ease with which supposedly airtight security regulations at the Los Alamos atom bomb project were penetrated, constituted the highlights David Greenglass, former Army technical sergeant.
Greenglass testified that he had been free to wander around any- where in the "tech area" at Los Alamos, a super-secret part of the project. As one of the 2,000 sol- diers at the project, he said, he got information from scientists and others, which he gave to Harry Gold and Julius Rosenberg for transmission to Russia.
https://www.nytimes.com/1951/03/14/archives/atom-bomb-spying-described-as-easy-witness-at-trial-of-3-tells-of.html

Greenglass cross-examined on security laxity at Los Alamos; testifies on Rosenberg instructions, after Fuchs arrest, for flight from US, using USSR embassies in Mex, Switzerland, Sweden and Czech; on money recd from Rosenberg for purpose after Gold arrest; on $4,000 given to O J Rogge, atty; defense tries to show Greenglass betrays sister to save wife; Bloch clashes with Kaufman

Mrs Greenglass testifies, corroborating husband's testimony on Rosenbergs approach to her; on funds recd; on efforts to escape after Gold arrest; defense tries to prove Greenglass motive was loss of money in business venture with Rosenberg
Mar 23, 1951 #ColdWar NYT Julius Rosenberg, charged by the Federal Government with the capital crime of wartime atomic espionage for the Soviet Union, flatly refused at his trial yesterday to say whether he had ever been a member of the Communist party.
Rosenberg said, “I am in favor, heartily in favor, of our Constitution and Bill of Rights and I owe my allegiance to my country at all times. I will fight for this country if it were engaged in a war with any other country."
https://www.nytimes.com/1951/03/23/archives/rosenberg-says-he-is-true-to-us-but-wont-tell-spy-jury-if-he-is-red.html

Rosenberg refuses to testify on Communist ties and on Perl; acknowledges membership in other orgns; professes allegiance to US; questioned on dismissal as Army Signal Corps civilian employs