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In 1945 German scientist Gernot Zippe was captured by the Soviet Union where he led the development of centrifuge-based uranium enrichment. In 1956 he was allowed to leave and later recreated the superior Soviet enrichment technology for the US. Why did the Soviet Union permit Zippe to leave?

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In 1945 German scientist Gernot Zippe was captured by the Soviet Union where he led the development of centrifuge-based uranium enrichment. In 1956 he was allowed to leave and later recreated the superior Soviet enrichment technology for the US. Why did the Soviet Union permit Zippe to leave?	214