Today,
The New York Times carried the obituary of Ruth Greenglass. Greenglass provided the corroboration for her husband, David Greenglass, stating that Ethel Rosenberg typed information about the development of the atomic bomb intended to be sent to the Soviet Union. On the basis of that information, Ethel Rosenberg, along with her husband Julius, were executed by the United States in June 1953 at the height of the hysteria of the Cold War.
Ethel Rosenberg's brother,David Greenglass, stated in his biography
The Brother: The Untold Story of the Rosenberg Case (2003), that he had no recollection of Ethel typing the information used to convict her, and that it was in fact his wife Ruth who had typed it.
The government's case against the Rosenbergs involved manipulation of witnesses and facts. Much controversy surrounds the nature of these secrets, and how a then-machinist (Greenglass) in the Army working in the Manhattan Project could have possessed the sophistication to comprehend and steal secret information on the development of the atomic bomb.
http://www.nytimes.com/2008/07/09/us/09greenglass.html?ref=obituaries