Ending union-organizing activity to secure participation in the atomic bomb project

Ending union-organizing activity to secure participation in the atomic bomb project was a consequential wartime choice by J. Robert Oppenheimer: he stepped back from organizing scientists at Berkeley’s Radiation Laboratory when he judged that continuing could exclude him from work he believed might help defeat Nazi Germany. His retreat changed what he did, not, the evidence stresses, what he believed about scientists’ social responsibilities.

The organizing meeting and its challenge

In autumn 1941, Oppenheimer invited Martin Kamen and others to an organizing meeting at his Eagle Hill home. Fifteen people gathered in his living room, among them Oppenheimer’s psychologist friend Ernest Hilgard, Berkeley chemist Joel Hildebrand, and George C. Eltenton, a chemical engineer at the Shell Development Company. Oppenheimer made his case for organizing Radiation Laboratory employees into FAECT, but the proposal encountered an immediate institutional objection: the scientists were effectively working for the U.S. Army, had signed security pledges, and, Kamen argued, could not decide independently of laboratory director Ernest Lawrence.

Kamen’s interruption unsettled Oppenheimer. The meeting ended without the unanimous support he had expected. A few days later, Oppenheimer admitted to Kamen, “Gee, I don’t know. Maybe I did the wrong thing.” He had gone to Lawrence, who reacted angrily to the prospect of a communist-backed union organizing his laboratory. Lawrence objected both to union membership and to his old friend’s continued involvement in left-wing politics; he had repeatedly reproached Oppenheimer for his “leftwandering activities.” Oppenheimer nevertheless defended the principle that scientists had a responsibility to help society’s “underdogs.”

The project sets the terms

The dispute mattered because Lawrence was also trying to bring Oppenheimer into the bomb effort. He complained that if Oppenheimer would stop what he called “nonsensical things,” it might be possible to get him onto the project, but that the Army would not accept him otherwise. The conflict was not simply between political conviction and personal advancement: Oppenheimer believed the atomic work might be necessary to defeat Nazi Germany, while Lawrence’s intervention made his eligibility for that work seem contingent on abandoning union organizing.

Oppenheimer already had a scientific connection to the developing project. Since early 1941, he had collaborated with Lawrence on work using the cyclotron to develop an electromagnetic method of separating uranium-235. Concern that German scientists might be ahead in fission research sharpened the urgency. At Lawrence’s insistence, Oppenheimer attended a secret meeting at General Electric’s laboratory in Schenectady on October 21, 1941. His calculation that one hundred kilograms of uranium-235 would suffice for an explosive chain reaction became an essential part of the meeting’s report to Washington. The meeting also convinced him that this rudimentary atomic-energy enterprise offered a way to be of direct use in the coming war.

A month later, Oppenheimer wrote to Lawrence that there would be no further difficulties with the union. He had not spoken to everyone involved, he acknowledged, but those he had spoken with agreed. The assurance closed his own organizing effort. Its stated logic was strategic: unless he followed Lawrence’s advice, he believed he would not be allowed to join a project he considered potentially vital. The account explicitly distinguishes this decision from a change of political views.

A retreat, not an end to the dispute

Oppenheimer’s withdrawal did not end union activity at the Radiation Laboratory. In early 1943, several of his students joined FAECT Local 25, including Rossi Lomanitz, Irving David Fox, David Bohm, Bernard Peters, and Max Friedman. Their circumstances differed from those of a conventional workplace campaign: they had no complaints about conditions, and Lomanitz earned $150 a month, more than twice his previous salary. Some regarded joining as a youthful, almost theatrical gesture; others were troubled that scientists had no voice in what would happen to their work on the bomb. The Army’s surveillance of the laboratory brought the union to official attention, and the War Department warned that some employees were active communists. The administration subsequently asked the Congress of Industrial Organizations to stop its organizing drive. These developments show the pressures surrounding the cause Oppenheimer had left, but they do not establish that he directed the later campaign.

The distinction between withdrawing from organizing and withdrawing from public responsibility remained important in the years that followed. By late 1944, scientists at Los Alamos were raising ethical questions about continuing to develop the bomb. When Robert Wilson proposed a formal discussion, Oppenheimer warned that it might bring trouble from security officials. Other scientists recalled that he discouraged meetings about the bomb’s political use, arguing that such questions were not the scientists’ task. Yet he attended Wilson’s meeting on the gadget’s impact on civilization and, in a later discussion, argued that the world should not be left ignorant of the weapon: keeping it secret, he maintained, risked making the next war an atomic one. His position had not become a simple retreat from politics. Rather, the boundary he drew between scientific work and political action shifted with the question before him—from organizing a union that could jeopardize his entry into the project to confronting the consequences of a weapon the project was building.

Significance of the choice

The episode exposes a pressure point in Oppenheimer’s wartime passage from political activism into government-directed science. Lawrence’s influence and the Army’s anticipated judgment helped make participation in the project conditional, while Oppenheimer’s own fear of Nazi progress gave that participation an urgent purpose. Ending the union effort secured his path toward the atomic enterprise, but it did not erase his conviction that scientists owed obligations to society. The choice is therefore best understood not as a clean break with his earlier commitments, but as a consequential accommodation between political principle, institutional access, and the perceived demands of war.