She was young and smart and claimed she was in love, and when Judith Coplon was accused of being a Soviet spy in 1949 she became a sensation. A 28-year-old Justice Department employee, Coplon had been caught with secret U.S. documents at a meeting with a Russian agent on a Manhattan street. She claimed she was meeting him only because she loved him, but she was found guilty at two trials. The convictions were overturned and the cases were eventually dropped. Coplon married one of her lawyers, raised four children in Brooklyn and became an educator and supporter of literacy....