(en) « For First Time, Figure in Rosenberg Case Admits Spying for Soviets », New York Times, (lire en ligne, consulté le ) — In an interview on Thursday, Mr. Sobell, who served nearly 19 years in Alcatraz and other federal prisons, admitted for the first time that he had been a Soviet spy.
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(en) « Helen L. Sobell, 84, Leader Of Effort to Spare Rosenbergs », New York Times, (lire en ligne, consulté le ) — Helen Levitov Sobell, a voice in the struggle to spare Julius and Ethel Rosenberg and free their co-defendant, Morton Sobell, her husband, died on April 15 in Redwood City, Calif. She was 84. She had long been in declining health, suffering from Alzheimer's disease, said her daughter, Sydney Gurewitz Clemens.
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(en) « Morton Sobell Free As Spy Term Ends », New York Times, (lire en ligne, consulté le ) — Morton Sobell, sentenced to 30 years for a wartime espionage conspiracy to deliver vital national secrets to the Soviet Union, was released from prison yesterday after serving 17 years and 9 months.