![]() ![]() When questioned, Greenglass admitted to spying. That same year, the FBI arrested both Greenglass and Gold based on information provided by Fuchs. Fuchs was charged with violating the Official Secrets Act, and he confessed to spying for the Soviet Union. His arrest began a chain of investigations, which ultimately led to the arrest of Julius and Ethel. In February 1950, Fuchs was arrested in the United Kingdom. Decrypted cables revealed this information through the Venona project. Army Signal Intelligence Service (SIS) discovered that Fuchs was a Soviet spy. He also worked with Klaus Fuchs, a physicist at Los Alamos and Soviet spy, to pass on atomic research secrets. Gold paid Greenglass $500 in exchange for information about the implosion lens in the atomic bomb. Harry Gold, a lab chemist and Soviet spy, passed this information to the USSR. Greenglass passed information to Julius, including information about the high explosive lenses being developed at Los Alamos for the implosion bomb. The engineers worked at top electronic firms, and they passed on confidential and useful information to the Soviet Union. Perl contributed to the development of the first jet fighter in the U.S. By 1944, Julius had recruited him to spy for the Soviets. McNutt was an engineer who worked at the Kellex design bureau in New York City. Greenglass served in the Army’s Special Engineer Detachment (SED), and was a machinist at Los Alamos. The network included: engineers (Julius Rosenberg, Nathan Sussman, Joel Barr, Alfred Sarant, Morton Sobell), a military aviation scientist ( William Perl), a civil design engineer (McNutt), and a machinist (Greenglass), among others. She and David met in the YCL, and married in 1942.īy 1945, the Soviets considered Rosenberg and his espionage network to be providing valuable information. Ruth joined the Young Communist League (YCL) after graduating high school. He provided classified documents and led an espionage network within the Manhattan Project, recruiting spies, most notably Russell McNutt and Ethel’s brother, David Greenglass, along with his wife Ruth. By 1942, Julius was heavily involved with espionage activities for the Soviet Union. He left the Communist Party to avoid suspicions. Army Signal Corps as a civilian engineer. Through her activism with the Communist Party, she met Julius Rosenberg in 1936. In the early 1930s, Ethel became a member of the Young Communist League. ![]() In 1951, Julius and his wife Ethel were tried and convicted of espionage for providing the Soviet Union with classified information. Julius Rosenberg was a key Soviet spy who passed along information to the Soviet Union and recruited Manhattan Project spies. To this day, historians and scientists debate how much espionage sped up the progress of the Soviet Union’s nuclear weapons program. The Soviet Union secretly conducted its first atomic weapons test on August 29, 1949. Some of the individuals who worked on the Manhattan Project were spies and provided valuable information on the design of the atomic bomb to the Soviet Union. Espionage was a major concern for the United States government during the Manhattan Project. ![]()
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