Other convicted co-conspirators were imprisoned, including Ethel's brother, David Greenglass, who supplied documents from Los Alamos to Julius and who served 10 years of a 15-year sentence; Harry Gold, who identified Greenglass and served 15 years in federal prison as the courier for Greenglass. Klaus Fuchs, a German scientist working in Los Alamos and handled by Gold, provided vastly more important information to the Soviets. He was convicted in Great Britain and served nine years and four months in prison.
For decades, the Rosenbergs' sons Michael and Robert Meeropol and many other defenders maintained that Julius and Ethel were innocent of spying on their country and victims of Cold War paranoia. After the fall of the Soviet Union, much information concerning them was declassified, including a trove of decoded Soviet cables, code-named VENONA, which detailed Julius's role as a courier and recruiter for the Soviets and Ethel's role as an accessory.
Their sons' current position is that Julius was legally guilty of the conspiracy charge, though not of atomic spying, while Ethel was only generally aware of his activities. The children say that their father did not deserve the death penalty and that their mother was wrongly convicted. They continue to campaign for Ethel to be posthumously and legally exonerated.
In 2014, five historians who had published works based on the Rosenberg case wrote that Soviet documents show that Ethel Rosenberg hid money and espionage paraphernalia for Julius, served as an intermediary for communications with his Soviet intelligence contacts, relayed her personal evaluation of individuals whom Julius considered recruiting, and was present at meetings with his sources.They also demonstrate that Julius reported to the KGB how Ethel persuaded Ruth Greenglass to travel to New Mexico to recruit David Greenglass as a spy.
Ethel Greenglass was born on September 25, 1915, to a Jewish family in Manhattan, New York City. She originally was an aspiring actress and singer, but eventually took a secretarial job at a shipping company. She became involved in labor disputes and joined the Young Communist League, where she met Julius in 1936. They married in 1939. Together they had two sons, Michael and Robert, born in 1943 and 1947 respectively.