We shall now focus on the Rosenbergs again - with Fuchs' arrest, a chain of thorough investigations led authorities to the Rosenbergs, which was made possible by American cryptanalysts who deciphered intercepted cables, known as the "Verona Cables" from the Soviet Consulate to the KGB.

One cable was a report by Fuchs on the progress of the Manhattan Project. When the latter was confronted with evidence of his espoinage, he confessed, and told authorities of his meetings with "Raymond", the Soviet spy. The FBI began a full-fledged investigation of "Raymond", and found his name to be Harry Gold. Having that information, they began to intergorate Gold. Gold offered a confession.

By the first of June, authorities then discovered a soldier who was stationed at Los Alamos, and who Gold paid $500 to in September 1945 in Albuquerque for information about the implosion lens of the atomic bomb. Gold said he could not remember the soldier's name, but recalled that his wife "may have been Ruth", and the former a New York City native.Within the next two days, Harry Gold was shown a picture of a man meeting the description he had given to the authorities.

The man pictured was David Greenglass.

On June 15th, 1950, David Greenglass was confronted and questioned by FBI officials. He readily admitted that he was the informant who passed information to Gold, and identified his wife and brother-in-law as participants in the Soviet spy ring. They were Ruth Greenglass and Julius Rosenberg.

What Greenglass said

According to David Greenglass, Rosenberg began to talk to him in abstract terms about espionage in late 1943. This was when the Rosenbergs started dropping out of the open Communist Party activities. Greenglass then suggested that the decision to drop out of the Communist Party was a necessary consequence of the Rosenberg's decision to work as a spy for the Soviet Union. For this, the Rosenbergs had a totally different explanation - Michael Rosenberg, their first child was just born. They wanted to spend more time at home.

In 1944, David Greenglass was assigned to work as a solder-machinist in Los Alamos. He claimed Rosenberg was excited by this, and thus asked Ruth Greenglass, to discuss with him with the possibility of providing information about the Manhattan Project research. He agreed.

Later, David Greenglass prepared handwritten notes and sketches related to a high-explosive lens mold being developed in a Los Alamos laboratory. He said such information was either passed directly to Rosenberg while he was on furlough in New York, or to Harry Gold who was sent to New Mexico to receive data.

Julius Rosenberg was alarmed when in October 1949 he learned through Soviet intelligence that the American authorities had information that might - or - will lead them to Los Almos spy Klaus Fuchs. Gold and Greenglass would be exposed if this should happen. According to Greenglass, Rosenberg hurried the former to obtain US Passports as soon as possible and prepare to flee to Europe. Fuchs was then arrested, and Rosenberg became anxiety-ridden. However, Greenglass' decision to reject his brother-in-law's advice was due to his wife, Ruth, who was 6 months pregnant and recovering from an accident in an apartment fire.