What might have made the Rosenbergs seem dangerous to the US government of the 1950s?

The Rosenbergs were associated with left-wing and radical political groups, which made them appear suspicious to U.S. officials during the anti-communist climate of the 1950s. Julius Rosenberg was accused of passing secrets to the Soviet Union, but he had not worked for the VENONA project, and neither spouse helped create Soviet atomic bombs. Therefore, the best answer is “Both were connected to radical groups.”

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