"In the decades that have followed the Rosenberg trial, whatever lingering doubts remained about Julius's guilt have evaporated as the result of release of the "Venona cables" and information released following the collapse of the Soviet Union. In 1997, Alexsandr Feklisov, Rosenberg's Soviet control came forward to describe his meetings with Julius in the 1940's. Feklisov credited Rosenberg with providing the information necessary for the Soviets to assemble a proximity fuse that would enable them to shoot down an American U2 spy plane in 1960. Feklisov, interviewed for a television documentary, obviously still had warm feelings for the man code-named "Liberal," and appeared outraged at the injustice he felt was perpetrated against Ethel who, insofar as he knew, engaged in no espionage work at all."