Verified Answer :

It was the "Espionage Act" that was in 1917 and made it illegal to subvert U.S. military personnel, since this was passed right after America's entry into World War I, when many citizens were still skeptical.

Answer:

Espionage Act

Explanation:

It was the "Espionage Act" that was in 1917 and made it illegal to subvert U.S. military personnel, since this was passed right after America's entry into World War I, when many citizens were still skeptical.