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|Born||Ruth Leah Printz
April 30, 1924
New York City, New York, U.S.
|Died||April 7, 2008
New York City, New York, U.S.
|Known for||Atomic spies for the Soviet Union|
|Parent(s)||Max Printz, Tillie Leiter|
|Relatives||Ethel Rosenberg, sister-in-law Religion Jewish|
Ruth Leah Printz was born to a Jewish family on April 30, 1924, in New York City to Max Printz and Tillie Leiter. She grew up in the same neighborhood, the Lower East Side, as her future husband, David Greenglass. She graduated with honors from Seward Park High School at 16. Although quite young, she and Greenglass wanted to marry before he was drafted to serve in World War II. They married in late November 1942 when he was 20 and she was 18. They shared an interest in politics and together joined the Young Communist League.
Julius Rosenberg became a Soviet agent working under Alexander Feklissov. In September 1944, Rosenberg suggested to Feklissov that he should consider recruiting his brother-in-law, David Greenglass and his wife. Feklissov met the couple and on 21 September, he reported to Moscow: "They are young, intelligent, capable, and politically developed people, strongly believing in the cause of communism and wishing to do their best to help our country as much as possible. They are undoubtedly devoted to us (the Soviet Union)."  David wrote to his wife: "My darling, I most certainly will be glad to be part of the community project (espionage) that Julius and his friends (the Russians) have in mind." 
After her husband was drafted and inducted into the Army in 1943, Ruth Greenglass continued to visit him. In November 1944, she visited him in Albuquerque, New Mexico, where he was working as a machinist on the Manhattan Project at Los Alamos. During that visit, she asked him to forward any information on the project to his brother-in-law Julius Rosenberg. When the FBI questioned him about suspected espionage activities, David Greenglass agreed to confess to his own activities and to testify against Julius and Ethel Rosenberg in exchange for immunity for his wife so that she could remain at home with their two children. At the trial, Ruth Greenglass implicated Ethel in the espionage ring by testifying that Ethel Rosenberg had typed up the notes that David Greenglass had provided. Ruth testified that both Rosenbergs had urged her to persuade her husband to become involved in espionage. Her testimony was crucial in securing Ethel's conviction. She rejoined her husband after his release from prison in 1960 and they lived in New York City under assumed names with their children.
She died on April 7, 2008, at the age of 83, a fact that became widely known only when the government, numbering her among the deceased witnesses, released her grand jury testimony a few weeks later. Her husband David survived her, dying in 2014, aged 92.
The truth of her testimony at the Rosenberg trial has been questioned. In September 2008, her grand jury transcripts were released and showed that when testifying before the grand jury in August 1950 Ruth Greenglass was asked, "Didn't you write [the information] down on a piece of paper?" and replied "Yes, I wrote [the information] down a piece of paper and [Julius Rosenberg] took it with him." At the trial she testified that Ethel Rosenberg typed up the notes about the atomic bomb.
- "Ruth Greenglass: pivotal figure in Rosenberg espionage case". Times Online. London, UK. July 11, 2008. Retrieved July 10, 2008.
- Hevesi, Dennis (July 9, 2008). "Ruth Greenglass, Key Witness in Trial of Rosenbergs". New York Times. Retrieved July 9, 2008.
- Alexander Feklissov, report on David and Ruth Greenglass (21 September, 1944)
- Christopher Andrew & Vasili Mitrokhin, The Mitrokhin Archive (1999) p. 169
- Sam Roberts, The Brother: The Untold Story of the Rosenberg Case (NY: Random House, 2003),ISBN 0-375-76124-1
- Watt, Holly (September 12, 2008). "Witness Changed Her Story During Rosenberg Spy Case". Washington Post. Retrieved September 12, 2008.
|Wikimedia Commons has media related to Rosenberg trial.|
- An Interactive Rosenberg Espionage Ring Timeline and Archive
- Vassiliev, Alexander (2003), Alexander Vassiliev’s Notes on Anatoly Gorsky’s December 1948 Memo on Compromised American Sources and Networks, retrieved April 21, 2012
- Douglas Linder, A Trial Account (2001)
- Annotated bibliography for Ruth Greenglass from the Alsos Digital Library for Nuclear Issues