FILE- In this April 6, 1951 file photo, a handcuffed David Greenglass is escorted by U.S. Deputy Marshall Eugene Fitzgerald from Federal Courthouse in New York City after being sentenced to 15 years in prison for conspiracy to spy for the Soviet Union. Greenglass, whose grand jury testimony helped send his sister and brother-in-law, Ethel and Julius Rosenberg, to the electric chair in 1953, has said in interviews that prosecutors pressured him to falsify information about his sister. (AP Photo)