The Atomic Energy Commission last week cleared Dr. Edward U. Condon, director of the National Bureau of Standards, of disloyalty. Five months ago, New Jersey's Representative J. Parnell Thomas, chairman of the House Un-American Activities Committee, had enveloped Dr. Condon in a cloud of suspicion. Condon, trumpeted Thomas, was "one of the weakest links in our atomic security"; he made pals, "knowingly or unknowingly," with "alleged Soviet espionage agents." Thomas refused to give Condon a public (or a private) hearing.

The five AEC commissioners (three of whom are Republicans) had reviewed two "thorough and painstaking" FBI investigations, including interviews with...

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