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

Julius and Ethel Rosenberg were associated with Communist and other left-wing political circles, which the US government viewed with suspicion during the Cold War. They did not both work on the Soviet atomic bomb, and Ethel was born in the United States, not Russia. The correct choice is “Both were connected to radical groups.”

AI-written and checked against the verified answer.