Julius Rosenberg and his wife were listening to the Lone Ranger with their two young sons when a stranger rapped on the door of their battered and drab apartment near the Manhattan end of the Brooklyn Bridge. Twelve men filed in from the small hallway and announced that they were from the FBI. They arrested 32-year-old Julius Rosenberg as a spy.

A puffy, spectacled native New Yorker with a smudge-sized mustache and disappearing black hair, Rosenberg was the fourth U.S. citizen arrested in the atomic spy roundup that began after the arrest of

British Physicist Klaus Fuchs. The FBI said Rosenberg...

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