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Ethel Rosenberg
Julius Rosenberg (May 12, 1918 – June 19, 1953) and Ethel Rosenberg (née Greenglass; September 28, 1915 – June 19, 1953) were an American couple who spied for the Soviet Union. They provided top-secret information about American radar, sonar, jet propulsion engines, and valuable nuclear weapon designs. Convicted of espionage in 1951, they were executed by the federal government of the United States in 1953 at Sing Sing Correctional Facility in Ossining, New York, becoming the first American civilians to be executed for such charges and the first to receive that penalty during peacetime.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.For decades many people including the Rosenbergs' sons (Michael and Robert Meeropol) maintained that Julius and Ethel were innocent of spying on their country and were victims of Cold War paranoia.
The extent of the Rosenbergs' activities came to light, however, when the U.S. government declassified information about them after the fall of the Soviet Union. This declassified information included a trove of decoded Soviet cables (code-name: Venona), which detailed Julius's role as a courier and recruiter for the Soviets, and information about Ethel's role as an accessory who helped recruit her brother David into the spy ring and did clerical tasks such as typing up documents that Julius then passed to the Soviets. In 2008, the National Archives of the United States published most of the grand jury testimony related to the prosecution of the Rosenbergs.
Source: Wikipedia