United States Atomic Energy Commission

The United States Atomic Energy Commission was created to place nuclear energy policy under civilian control, yet it became both a forum for scientific advice and an instrument of security review. Its history in this account turns on that double function: the Commission enlisted J. Robert Oppenheimer as a leading adviser, then treated his dissent over the thermonuclear weapon and his past associations as grounds for removing his access to classified work.

Creation and Civilian Authority

The Commission emerged from a contest over who would govern nuclear energy after the war. Scientists lobbied successfully to defeat the May-Johnson bill, which had prompted concern about the proposed arrangements. A new bill, introduced by Connecticut senator Brien McMahon, instead proposed an exclusively civilian United States Atomic Energy Commission. President Harry S. Truman signed the resulting Atomic Energy Act on August 1, 1946, establishing the Commission.

The victory for civilian administration was qualified from the outset. By the time the law passed, it had been altered, and its provisions imposed a security regime on nuclear physicists more severe than the one they had experienced at Los Alamos. The Commission therefore embodied a contradiction: nuclear policy was placed in civilian hands, but the state’s control of information and scrutiny of the people who worked with it were intensified. What counted as civilian authority did not mean open scientific governance.

The General Advisory Committee

That autumn, Truman appointed David Lilienthal chairman of the Commission. As Congress required, Lilienthal established a General Advisory Committee to assist the commissioners. Despite Truman’s dislike of Oppenheimer, excluding the scientist who had become publicly associated with the bomb was difficult. Truman appointed him alongside Isidor Isaac Rabi, Enrico Fermi, James Conant, Cyril S. Smith, Hartley Rowe, Hood Worthington, Lee DuBridge, and Glenn Seaborg.

The commissioners left the choice of chair to the advisers themselves. A news report mistakenly suggested that Conant would lead the committee, prompting Katherine(Kitty)Oppenheimer to ask her husband why he had not been named. Oppenheimer assured her that it was not a major issue. Behind the scenes, however, DuBridge and Rabi were advocating for him. At the General Advisory Committee’s first formal meeting in early January 1947, Oppenheimer arrived late after a snowstorm and learned that his colleagues had unanimously elected him chairman.

The committee gave the Commission a channel for advice from scientists, but it did not itself replace the commissioners as the authority responsible for decisions. Its importance lay in the questions it brought into government deliberation. In particular, its majority challenged the strategic case for developing a thermonuclear weapon. The report argued that a weapon with a possible yield of 100 million tons of TNT, compared with 15,000 tons for the Hiroshima bomb, could destroy hundreds of square miles and might become a weapon of genocide. Even possession, the committee warned, could damage American security by shaping world opinion.

The committee also questioned whether building a thermonuclear weapon would deter the Soviet Union. If the Soviets developed one, they would have to test it, and the test would be detected; the existing American atomic arsenal, the report argued, could provide comparably effective retaliation. This reasoning anticipated arms-control arguments, but it did not prevail as national policy. The Commission’s advisory structure could give dissenting experts a voice without ensuring that their assessment governed the outcome.

Advice, Security, and Oppenheimer

Oppenheimer’s appointment to the committee coincided with a broad review of security clearances under the new law. Before accepting a position at the Institute for Advanced Study, he had warned Lewis Strauss that derogatory information about him existed. Strauss initially dismissed the warning. The subsequent FBI review of Commission employees required the commissioners to examine Oppenheimer’s file and gave the Bureau an opportunity to investigate him openly. Agents followed Oppenheimer and interviewed more than twenty associates, including Robert G. Sproul and Ernest Lawrence. Those interviewed vouched for his loyalty; Sproul reported that Oppenheimer had described himself as ashamed and embarrassed by his left-wing past.

Strauss later told Oppenheimer that he had examined the file and found nothing that barred his appointment at the Institute. The Commission’s clearance decision nevertheless took longer: on August 11, 1947, it unanimously granted him a top-secret Q clearance. Even Strauss voted in favor. The episode shows the Commission initially accepting Oppenheimer after scrutiny, rather than treating his political history as an automatic disqualification.

The terms of that acceptance became more contested as the Commission considered weapons policy. Oppenheimer opposed an accelerated program to develop the thermonuclear weapon, while the General Advisory Committee’s report set out the strategic and moral objections. In 1951, after being shown an Air Force plan calling for the destruction of Soviet cities on a scale that shocked him, he condemned the plan in private. He also advocated tactical nuclear weapons as a possible alternative to a genocidal strategic assault. But that alternative carried its own danger: placing nuclear weapons on the battlefield could make their actual use more likely and risk escalation into a larger exchange.

By 1953, the Commission’s leadership had changed. Lewis Strauss, appointed atomic energy adviser to President Dwight D. Eisenhower in January, became Commission chairman in July. On taking office, Strauss sought Oppenheimer’s latest FBI summary report and studied it closely. Oppenheimer’s consulting contract had been renewed for another year, allowing him to continue lobbying for greater candor in nuclear policy; Strauss moved quickly to reexamine his file. The change in leadership brought the conflict between advisory dissent and security judgment into the Commission’s own proceedings.

The Oppenheimer Review and Its Aftermath

On Christmas Eve 1953, FBI agents took control of Oppenheimer’s remaining classified papers at Olden Manor. That day he received the Commission’s formal letter of charges, dated December 23. It questioned whether his continued work for the government endangered national security and cited his past associations with Communists, contributions to the Communist Party of California, the Chevalier affair, and his opposition to the thermonuclear program. The inclusion of his policy opposition made the case more than a review of personal associations: it treated a dispute over weapons policy as relevant to whether an adviser could be trusted.

The charges were a political indictment, not a criminal prosecution. Strauss appointed the review panel, and the Commission’s general manager, Kenneth Nichols, later sent the commissioners a brief that reframed the panel’s report. Nichols’s letter was prepared under the guidance of Strauss, Charles Murphy, and Roger Robb. Oppenheimer’s lawyers did not know about it. Although commissioner Henry DeWolf Smyth warned that denying the lawyers an opportunity to respond could invite grave criticism when the letter became public, their request to present an oral argument was rejected.

The Commission’s final deliberations were also marked by pressure and unequal access. Strauss feared the commissioners might reverse the panel’s recommendation, and at one point anticipated a three-to-two decision in Oppenheimer’s favor. He hosted lavish lunches and discussed private-industry employment with Smyth, who wondered whether Strauss was trying to buy his vote. The resulting vote was four to one that Oppenheimer was loyal and four to one that he was a security risk. The majority decision, drafted by Strauss, dropped the hydrogen-bomb issue that had been central to the panel’s decision and instead emphasized alleged defects of character, particularly the Chevalier affair and Oppenheimer’s earlier associations with Communist students.

The Commission rescinded Oppenheimer’s clearance one day before it was due to expire. David Lilienthal recorded his dismay at both the judgment of Oppenheimer and the commissioners’ understanding of what wise public service required. Albert Einstein responded with a bitter renaming of the agency as the Atomic Extermination Conspiracy. The episode left the Commission’s dual authority exposed: it had been created to place nuclear policy in civilian hands and had relied on scientific advisers, yet it could also exclude an adviser through a process shaped by political conflict and security judgments.

The handling of the hearing record extended that conflict beyond the clearance decision. Earlier in June, Strauss persuaded the commissioners to publish all 3,000 typewritten pages of the transcript through the Government Printing Office, claiming that a copy had been stolen from a train; it was soon found in the lost-and-found office at Pennsylvania Station. Publishing the record violated the Gray Board’s promise that witnesses’ testimony would remain confidential. Strauss judged public relations more urgent than that commitment. The Commission thus exercised power not only over who could consult on classified work, but also over how the dispute and its testimony would enter public view.