Which allowed the US government to prosecute and imprison IWW members?

The Espionage Act of 1917 made it illegal to interfere with U.S. military recruitment or to obstruct the war effort. The government used it during World War I to prosecute and imprison members of the Industrial Workers of the World (IWW), whom officials accused of hindering the war effort. The Espionage Act is the correct choice.

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