Sallow, pasty-faced Chemist Harry Gold of Philadelphia had lost 50 lbs. since the FBI jailed him last summer. The man who was spy Klaus Fuchs’s go-between in passing top U.S. atomic secrets to ...

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.