The 79-year-old David Greenglass confessed in an interview with CBS that he had committed perjury, encouraged by prosecutors, while testifying against his own sister, Ethel Rosenberg. She and her husband were sent to the electric chair almost 50 years ago. Greenglass, who was charged along with the Rosenberg family, with stealing the secret of the atom bomb for the Soviet Union, agreed to have a deal with the prosecution to save his life. But, in addition, he trumped up evidence against his own sister that she was involved in the spy ring. Due to Greenglass's story that his sister typed his reports to Moscow, the judge found Ethel Rosenberg guilty and imposed the death penalty. Now Greenglass says he does not remember who in fact typed those papers. Greenglass himself would not apologize for his role, saying he could not sacrifice his wife and children for his sister. His interview forestalled appearance of the book titled "The Brother. The Untold Story of Atomic Spy David Greenglass And How He Sent His Sister Ethel Rosenberg To The Electric Chair". The 1951 trial of the "spy couple" was one of the gloomiest episodes of the Cold War. The were the only Americans sentenced to death and executed for espionage to the Soviet Union.