Interim Committee

The Interim Committee was a secret high-level group created in May 1945 by United States Secretary of War, Henry L. Stimson at the urging of leaders of the Manhattan Project and with the approval of President Harry S. Truman to advise on matters pertaining to nuclear energy, and replaced the Military Policy Committee.

Composed of prominent political, scientific and industrial figures, the Interim Committee had broad terms of reference which included advising the President on wartime controls and the release of information, and making recommendations on post-war controls and policies related to nuclear energy, including legislation. Its first duty was to advise on the manner in which nuclear weapons should be employed against Japan. Later, it advised on legislation for the control and regulation of nuclear energy. It was named "Interim" in anticipation of a permanent body that would later replace it after the war, where the development of nuclear technology would be placed firmly under civilian control. The Atomic Energy Commission was enacted in 1946 to serve this function.

Stimson himself was chairman. The other members were: James F. Byrnes, former US Senator and soon to be Secretary of State, as President Truman's personal representative; Ralph A. Bard, Under Secretary of the Navy; William L. Clayton, Assistant Secretary of State; Vannevar Bush, Director of the Office of Scientific Research and Development and president of the Carnegie Institution; Karl T. Compton, Chief of the Office of Field Service in the Office of Scientific Research and Development and president of Massachusetts Institute of Technology; James B. Conant, Chairman of the National Defense Research Committee and president of Harvard University; and George L. Harrison, an assistant to Stimson and president of the New York Life Insurance Company. Harrison chaired the committee when Stimson was absent, but Byrnes, as the President's personal representative, was probably its most influential member.

The Interim Committee held its first meeting on 9 May 1945. Stimson began by outlining its broad terms of reference, which included advising the President on wartime controls and the release of information, and making recommendations on post-war controls and policies related to nuclear energy, including legislation. The Interim Committee was not specifically charged with making recommendations on the military use of nuclear weapons but the composition of the committee and the close relationship between the wartime use of nuclear weapons and post-war policies regarding them inevitably led to the Interim Committee's involvement.

The most immediate of the committee's tasks, one that has been the focus of much subsequent controversy, was to make recommendations concerning the use of the atomic bomb against Japan. The committee's consensus, arrived at in a meeting held June 1, 1945, is described as follows in the meeting's log:

Mr. Byrnes recommended, and the Committee agreed, that the Secretary of War should be advised that, while recognizing that the final selection of the target was essentially a military decision, the present view of the Committee was that the bomb should be used against Japan as soon as possible; that it be used on a war plant surrounded by workers’ homes; and that it be used without prior warning.

One member, Bard, later dissented from this decision and in a memorandum to Stimson laid out a case for a warning to Japan before using the bomb.

In arriving at its conclusion, the committee was advised by a Scientific Panel of four physicists from the Manhattan Project: Enrico Fermi and Arthur H. Compton of the Metallurgical Laboratory at the University of Chicago; Ernest O. Lawrence of the Radiation Laboratory at the University of California at Berkeley; and J. Robert Oppenheimer, who directed the bomb assembly program at Los Alamos. Reinforcing the decision arrived at on June 1, the scientists wrote in a formal report on June 16: