What might have made the Rosenbergs seem dangerous to the US government of the 1950s? Both worked to create the first atomic bombs for the USSR.
Both were connected to radical groups.
Julius had worked for the VENONA project.
Ethel was a Russian immigrant who arrived after WWII.

roosevelt believed that in light of the country's recent military successes, it was unnecessary to use force to achieve foreign policy goals, so long as the military could threaten force. this belief, and his strategy of “speaking softly and carrying a big stick,” shaped much of roosevelt's foreign policy.