Julius and Ethel Rosenberg were American citizens who were convicted of spying on behalf of the Soviet Union. The couple was accused of providing top-secret information about radar, sonar, jet propulsion engines, and valuable nuclear weapon designs; at that time the United States was the only country in the world with nuclear weapons. Convicted of espionage in 1951, they were executed by the federal government of the United States in 1953 in the Sing Sing correctional facility in Ossining, New York.
Other convicted co-conspirators were sentenced to prison, including Ethel’s brother, David Greenglass (who had made a plea agreement), Harry Gold, and Morton Sobell. Klaus Fuchs, a German scientist working in Los Alamos, was convicted in the United Kingdom. (All were jewish by ethnicity). Klaus Fuchs, a refugee theoretical physicist working for the British mission in the Manhattan Project, had given key documents to the Soviets throughout the war. Fuchs identified his courier as American Harry Gold, who was arrested on May 23, 1950.Gold confessed and identified David Greenglass as an additional source.
On June 15, 1950, David Greenglass was arrested by the FBI for espionage and soon confessed to having passed secret information on to the USSR through Gold. He also claimed that his sister Ethel’s husband Julius Rosenberg had convinced David’s wife Ruth to recruit him while visiting him in Albuquerque, New Mexico, in 1944. He said Julius had passed secrets and thus linked him to the Soviet contact agent Anatoli Yakovlev. This connection would be necessary as evidence if there was to be a conviction for espionage of the Rosenbergs.
Another accused conspirator, Morton Sobell, fled with his family to Mexico City after Greenglass was arrested. They took assumed names and he tried to figure out a way to reach Europe without a passport. Abandoning that effort, he returned to Mexico City. He claimed that he was kidnapped by members of the Mexican secret police and driven to the U.S. border, where he was arrested by U.S. forces.
Source : 1.Radosh, Ronald (June 10, 2016). “Rosenbergs Redux”.
2.”What the K.G.B. Files Show About Ethel Rosenberg”. The New York Times. August 13, 2015.
3.. “The New York Times Gets Greenglass Wrong”. Weekly Standard. Retrieved October 5, 2016.
4. Ranzal, Edward (March 19, 1953). “Greenglass, in Prison, Vows to Kin He Told Truth about Rosenbergs”. The New York Times. Retrieved July 7, 2008. David Greenglass, serving 15 years as a confessed atom spy, denied to members of his family recently that he had been coached by the Federal Bureau of Investigation in the drawing of segments of the atom bomb.
5. Whitman, Alden (February 14, 1974). “1972 Death of Harry Gold Revealed”. The New York Times. Retrieved July 7,2008. Harry Gold, who served fifteen years in Federal prison as a confessed atomic spy courier, for Klaus Fuchs, a Soviet agent, and who was a key Government witness in the Julius and Ethel Rosenberg espionage case in 1951, died 18 months ago in Philadelphia.