Over four weeks in 1954, the United States Atomic Energy Commission (AEC) explored the background, actions, and associations of J. Robert Oppenheimer, the American scientist who directed the Los Alamos Laboratory during World War II as part of the Manhattan Project to develop the atomic bomb. The hearing resulted in Oppenheimer's Q clearance being revoked. This marked the end of his formal relationship with the Eisenhower government and generated considerable controversy regarding whether the treatment of Oppenheimer was fair, or whether it was an expression of anti-communist McCarthyism. Doubts about Oppenheimer's loyalty dated back to the 1930s, when he was a member of numerous Communist front organizations and was associated with Communist Party USA members, including his wife, brother and sister-in-law. These associations were known to Army Counterintelligence at the time he was made director of the Los Alamos Laboratory in 1942 and chairman of the influential General Advisory Committee of the AEC in 1947. In this capacity, Oppenheimer became involved in bureaucratic conflict between the Army and Air Force over the types of nuclear weapons the country required, technical conflict between the scientists over the feasibility of the hydrogen bomb, and personal conflict with AEC commissioner Lewis Strauss. The proceedings were initiated after Oppenheimer refused to voluntarily give up his security clearance while working as an atomic weapons consultant for the US government, under a contract due to expire at the end of June 1954. Several of his colleagues testified at the hearings. As a result of the two-to-one decision of the hearing's three judges, he was stripped of his security clearance one day before his consultant contract was due to expire. The panel found that he was loyal and discreet with atomic secrets, but did not recommend that his security clearance be reinstated. The loss of his security clearance ended Oppenheimer's role in government and policy. He became an academic exile, cut off from his former career and the world he had helped to create. The reputations of those who had testified against Oppenheimer were tarnished as well, though Oppenheimer's reputation was later partly rehabilitated by presidents John F. Kennedy and Lyndon B. Johnson. The brief period when scientists were viewed as a "public-policy priesthood" ended; thereafter, they would serve the state only to offer narrow scientific opinions. Scientists working in government were on notice that dissent was no longer tolerated. The fairness of the proceedings has been a subject of controversy, criticized in the Oppenheimer biography American Prometheus (2005) and dramatized in film and television. On December 16, 2022, United States secretary of energy Jennifer Granholm nullified the 1954 decision, saying that it had been the result of a "flawed process" and affirming that Oppenheimer had been loyal.
Background Before World War II, Robert Oppenheimer had been professor of physics at the University of California, Berkeley. The scion of a wealthy New York family, he was a graduate of Harvard University and had studied in Europe at the University of Cambridge in England, the University of Göttingen in Germany (where he had earned his doctorate in physics at the age of 23 under the supervision of Max Born), and the University of Leiden in the Netherlands. As one of the few American physicists with a deep understanding of the new field of quantum mechanics, he was hired by the University of California in 1929. As a theoretical physicist, Oppenheimer had considerable achievements. In a 1930 paper on the Dirac equation, he predicted the existence of the positron. A 1938 paper co-written with Robert Serber explored the properties of white dwarf stars. This was followed by one co-written with one of his students, George Volkoff, in which they demonstrated that there was a limit, the so-called Tolman–Oppenheimer–Volkoff limit, to the mass of stars beyond which they would not remain stable as neutron stars and would undergo gravitational collapse. In 1939, with another of his students, Hartland Snyder, he went further and predicted the existence of what are today known as black holes. It was decades before the significance of this was appreciated. Still, Oppenheimer was not well known before World War II, and certainly not as renowned as his friend and colleague Ernest O. Lawrence, who was awarded the Nobel Prize in Physics in 1939 for his invention of the cyclotron. As an experimental physicist, Lawrence had come to rely on Oppenheimer, and it was Lawrence who brought Oppenheimer into the effort to develop an atomic bomb, which became known as the Manhattan Project. Brigadier General Leslie R. Groves, Jr., who became director of the Manhattan Project on September 8, 1942, met Oppenheimer at Berkeley, where Oppenheimer briefed Groves on the work done so far on the "Super" (thermonuclear) bomb. Oppenheimer told Groves on October 8 that the Manhattan Project needed a dedicated weapons development laboratory. Groves agreed, and after a second meeting with Oppenheimer on a train on October 15, decided that Oppenheimer was the man he needed to head what became the Los Alamos Laboratory, despite Oppenheimer's lack of a Nobel Prize or administrative experience. The end of the Pacific War in the wake of the atomic bombing of Hiroshima and Nagasaki made scientists into heroes. Oppenheimer became a celebrity, with his face appearing on front pages of newspapers and the covers of magazines. Life magazine described him as "one of the most famous men in the world, one of the most admired, quoted, photographed, consulted, glorified, well-nigh deified as the fabulous and fascinating archetype of a brand new kind of hero, the hero of science and intellect, originator and living symbol of the new atomic age."
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