ESPIONAGE: The Smaller Ones

Patiently, month after month, the FBI had been trying to untangle the all-but-invisible skeins of plot and counterplot by which Russia had stolen U.S. atomic secrets. The pursuit of Britain's Dr. Klaus Fuchs, physicist and traitor, started the process. After his arrest, it took 3½ months of painful toil before U.S. agents worked their way back along his trail to Harry Gold, the Philadelphia chemist. After that, the untangling progressed quickly. Last week, 23 days after catching Gold, the FBI picked up two of his confederates.

The first, a 44-year-old chemical technician...

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