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To develop new legislation governing the use of atomic energy in the United States, the U.S. Senate created a Special Committee that held a series of public hearings in late 1945 and early 1946. In his testimony on 28 November 1945, General Leslie Groves discussed the scope of the Manhattan Project, the problem of international control, and the destructive effects of atomic explosions. He did not provide a factual account of radiation effects, however, although the information provided by Stafford Warren would have made reasonably informative answers entirely possible, but Groves may not have had time to assimilate it. Perhaps wanting to preserve secrecy or possibly unwilling to admit uncertainty, Groves made bizarre and misleading statements to the Senators.

Atomic Energy: Hearings before the Special Committee on Atomic Energy, United States Senate, Seventy-Ninth Congress, First Session, Part 1  (Washington, D.C.: United States Government Printing Office, 1945), excerpt

Stafford Warren Papers, University of California Los Angeles Libraries Special Collections, box 68, Folder 7

Stafford Warren Papers, University of California Los Angeles Libraries Special Collections, box 68, Folder 7

U.S. Senate, 79th Congress, 1st session, Committee on Naval Affairs, Committee Print

RG 218, Joint Chiefs of Staff, Central Decimal Files, 1948-1950, box 231, CCS 476.1 (10-16-1945), Section 9.

W.A. Harriman Papers, Library of Congress, box 211, Robert Pickens Meiklejohn World War II Diary At London and Moscow March 10, 1941-February 14, 1946, Volume II (Privately printed, 1980 [Printed from hand-written originals]) (Reproduced with permission)

Yale University, Medical Historical Library, Harvey Cushing/John Hay Whitney Medical Library, Averell A. Liebow Papers, box 3, folder 36

Yale University, Medical Historical Library, Harvey Cushing/John Hay Whitney Medical Library, Averell A. Liebow Papers, box 3, folder 36

National Archives and Records Administration, RG 80, General Records of the Department of the Navy, SecNav/CNO Top Secret Correspondence File 1945, A8, Box 21, Folder A8. Top Secret. Also reproduced in CIA Cold War Records: The CIA under Harry Truman, pp. 8–10.

RG 77, Tinian Files, April-December 1945, box 17, Envelope B

RG 77, Tinian Files, April-December 1945, box 17, Envelope B

RG 77, Tinian Files, April-December 1945, box 17, Envelope B

RG 77, Tinian Files, April-December 1945, box 17, Envelope B

RG 77, Tinian Files, April-December 1945, box 17, Envelope B

RG 77, Tinian Files, April-December 1945, box 17, Envelope B

National Archives, Donated Records of General Leslie R. Groves, Visitations and Telephone Call Diaries, box 3

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