July 11, 1950 Gordon E. Dean became chairman of the Atomic Energy Commission. July 17, 1950 Julius Rosenberg was arrested by the FBI and charged with conspiracy to commit espionage. His wife Ethel was arrested in August. On June 19, 1953 they were executed. October 9, 1950 President Truman approved an expansion of Commission facilities which produced uranium and plutonium for nuclear weapons. November 26, 1950 December 16, 1950 - Chinese troops entered: the fighting in Korea. President Truman declared a Naticnal -Emergency due to the fighting in Korea. December 18, 1950 President Truman approved the Ccmmission's recommendation to establish a continental proving ground. Jamuary-February 1951 Operation Ranger, the first continental nuclear test series conducted at the Nevada Proving Ground, now called Nevada Test Site, 60 miles north of Las Vegas, Nevada. pril-May 1951 The Commission conducted Operation Greenhouse at Enewetak, detonating four tests. October-November 1951 Jamary 11, 1952 . January 16, 1952 Five shots were fired. - a The Commission conducted Operation Buster-Jangle at the Nevada Test Site, which consisted of seven tests. United Nations Disarmament Commission established. The National Security Council approved second major expansion of the Commission's nuclear production facilities. Aprii-June 1952 June 1952 The Commission conducted Operation Tumbler-Snapper at the Nevada Test Site, detonating eight nuclear tests. University of California's Live=more Laboratory, now Lawrence Livermmre National Laboratory, established by the Commission.