McCloy’s testimony produced some memorable exchanges as he tried to raise issues that bore directly on the very legitimacy of the hearing. He began his defense of Oppenheimer by questioning the Gray Board’s definition of security: “I don’t know just exactly what you mean by a security risk. I know that I am a security risk and I think every individual is a security risk. . . . I think there is a security risk in reverse. . . . We are only secure if we have the best brains and the best reach of mind. If the impression is prevalent that scientists as a whole have to work under such great
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