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Pike, Sumner T. (Sumner Tucker), 1891-1976

President Harry S. Truman Signing an Executive Order with Members of the Atomic Energy Commission

In the presence of the Atomic Energy Commission, President Harry S. Truman signs an Executive Order that ended the wartime Manhattan Project and transferred its responsibilities to civilian authority. From left to right, Carroll Wilson, President Harry S. Truman, David Lilienthal, Sumner Pike, Colonel K.D. Nichols, Secretary of War Robert P. Patterson, General Leslie Groves, Lewis L. Strauss, and William W. Waymack. From the Scrapbooks of Matt Connelly, Volume 2.