This week's programme in the series on Man and Science Today.
Tonight Horizon goes back almost 25 years to examine in dramatic form the motives and characters of two men, both brilliant physicists, who gave to Russia secret information about the development of the atom bomb. Their names were Klaus Fuchs and Alan Nunn May. They were found guilty of treason and served long prison terms.
But to this day many scientists claim that Fuchs and May sacrificed themselves for the good of society. This programme examines their dilemma: should a scientist put his loyalty to mankind before his loyalty to his country?

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