In September 1949, the world was shocked to learn that the Soviet Union had conducted its first nuclear weapons test, just four years after the United States dropped the first atomic bombs on Hiroshima and Nagasaki. U.S. authorities thought there was only one way the Soviets could narrow the nuclear arms gap so quickly -- by stealing atomic secrets from the U.S.

In 1950, the FBI arrested a young Jewish couple, Julius and Ethel Rosenberg, for running a spy ring and passing nuclear secrets to the Soviet Union. At their trial, the Rosenbergs became lightning rods for controversy and anti-communist hysteria. But the true extent of their guilt would remain shrouded in mystery for decades to come.

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