Julius and Ethel Rosenberg

Julius Rosenberg (May 12, 1918 – June 19, 1953) and Ethel Rosenberg (born Greenglass; September 28, 1915 – June 19, 1953) were an American married couple who were convicted of spying for the Soviet Union, including providing top-secret information about American radar, sonar, jet propulsion engines, and nuclear weapon designs. Convicted of espionage in 1951, they were executed by the federal government of the United States in 1953 using New York's state execution chamber in Sing Sing in Ossining, New York, becoming the first American civilians to be executed for such charges and the first to be executed 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 at the Los Alamos Laboratory, was convicted in the United Kingdom. For decades, many people, including the Rosenbergs' sons (Michael and Robert Meeropol), have maintained that Ethel was innocent of spying and have sought an exoneration on her behalf from multiple U.S. presidents.

Among records the U.S. government declassified after the fall of the Soviet Union are many related to the Rosenbergs, included a trove of decoded Soviet cables (code-name Venona), which detailed Julius's role as a courier and recruiter for 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. Freedom of Information Act (FOIA) requests filed about the Rosenbergs and the legal case against them have resulted in additional U.S. government records being made public, including formerly classified materials from U.S. intelligence agencies.