Treason

Atomic spy David Greenglass, who helped send the Rosenbergs to the electric chair, dies at 92

  • FILE - In this April 26, 1956, file photo, David Greenglass sits beside Deputy U.S. Marshal Joseph Oreto, left, at the Senate Internal Security in Washington. The former Army sergeant and Los Alamos bomb project employee, whose testimony led to the conviction and execution of his sister, Ethel Rosenberg and brother-in-law, Julius Rosenberg, died on July 1. He was 92. (AP Photo/Henry Griffin, File)

    FILE - In this April 26, 1956, file photo, David Greenglass sits beside Deputy U.S. Marshal Joseph Oreto, left, at the Senate Internal Security in Washington. The former Army sergeant and Los Alamos bomb project employee, whose testimony led to the conviction and execution of his sister, Ethel Rosenberg and brother-in-law, Julius Rosenberg, died on July 1. He was 92. (AP Photo/Henry Griffin, File)  (The Associated Press)

  • FILE - In this April 5, 1951, file photo, David Greenglass, second from left, former army sergeant, is led into Federal Courthouse in New York by U.S. Deputy Marshall Eugene Fitzgerald, left, for sentencing as an atom spy. Greenglass, whose testimony led to the conviction and execution of his sister, Ethel Rosenberg and brother-in-law, Julius Rosenberg, died on July 1. He was 92. (AP Photo/File)

    FILE - In this April 5, 1951, file photo, David Greenglass, second from left, former army sergeant, is led into Federal Courthouse in New York by U.S. Deputy Marshall Eugene Fitzgerald, left, for sentencing as an atom spy. Greenglass, whose testimony led to the conviction and execution of his sister, Ethel Rosenberg and brother-in-law, Julius Rosenberg, died on July 1. He was 92. (AP Photo/File)  (The Associated Press)

  • FILE - In this April 6, 1951, file photo, David Greenglass, left, arrives at Federal Court led by U.S. Deputy Marshal Eugene Fitzgerald in New York for sentencing as a member of an atomic spy ring which passed on secrets to Russia. Greenglass pleaded guilty. The former Army sergeant whose testimony led to the conviction and execution of his sister, Ethel Rosenberg and brother-in-law, Julius Rosenberg, died on July 1. He was 92. (AP Photo/File)

    FILE - In this April 6, 1951, file photo, David Greenglass, left, arrives at Federal Court led by U.S. Deputy Marshal Eugene Fitzgerald in New York for sentencing as a member of an atomic spy ring which passed on secrets to Russia. Greenglass pleaded guilty. The former Army sergeant whose testimony led to the conviction and execution of his sister, Ethel Rosenberg and brother-in-law, Julius Rosenberg, died on July 1. He was 92. (AP Photo/File)  (The Associated Press)

The sons of Julius and Ethel Rosenberg say David Greenglass — a key figure in the biggest atomic spying case of the Cold War — has died at age 92.

Greenglass died July 1, according to Michael and Robert Meeropol.

Greenglass served 10 years in prison for his part in a plot to steal atomic secrets for the Soviet Union. He gave testimony that sent the Rosenbergs — who were his sister and brother-in-law — to the electric chair in 1953.

Decades later, Greenglass admitted lying on the stand about his sister's role.