| Shortly after World War II began with
the German invasion of Poland on September 1, 1939, Vannevar Bush,
president of the Carnegie Foundation, became convinced of the need for
the government to marshal the forces of science for a war that would
inevitably involve the United States.
With the imminent fall of France undoubtedly on
Roosevelt's mind, it only took a short time for Bush to obtain the
President's approval for the establishment of a national science
organization.
In June of 1940, the National Defense Research
Committee, with Bush as its head, reorganized the Uranium Committee
into a scientific body and eliminated military membership. Not
dependent on the military for funds, as the Uranium Committee had
been, the National Defense Research Committee had more influence and
more direct access to money for nuclear research.
In the interest of national security, Bush barred
foreign-born scientists from committee membership and blocked the
further publication of articles on uranium research. In
addition, funding for continued research into uranium isotope
separation and chain reactions was approved for the remainder of 1940.
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