GREAT BRITAIN: Positively Vet

When German-born Scientist Klaus Fuchs was sent to prison in 1950 for slipping British atomic secrets to the Russians, many of his toughest mathematical chores were taken over by chubby Boris Davison, a top scientist at Harwell. Dr. Davison got a complete security clearance, though he was born in Russia (to a British father and a Russian mother) and his mother still lives in the Soviet Union. When another top atomic scientist, Italian-born Bruno Pontecoryo, absconded to Russia with nobody-knows-how-much secret information, Dr. Davison got another checkup, and was cleared, even though it was known that he still wrote...

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