Rosenberg sons acknowledge their father was a spy

After years of professing their parents' innocence, the sons of Julius and Ethel Rosenberg are acknowledging that their father was a spy.

The about-face came after their father's co-defendant, Morton Sobell, admitted for the first time that he and Julius Rosenberg stole nonatomic military and industrial secrets for the Soviet Union.

The Rosenbergs were executed in 1953 for passing atomic secrets to the Soviet Union. Since then, decoded Soviet cables have appeared to confirm that Julius was a spy, but doubts have remained about Ethel's involvement.

The 91-year-old Sobell, who was convicted with the Rosenbergs on espionage charges in 1951 and …