Which event prompted the harshest crackdowns on free speech since the Sedition Act of 1798?

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The event that prompted the harshest crackdowns on free speech since the Sedition Act of 1798 was World War I. The US government enacted the Espionage Act and the Sedition Act of 1918, which made it illegal to criticize the government, the military, or the war effort. Many people were arrested and prosecuted under these laws, including socialists, pacifists, and labor activists. The Supreme Court upheld these laws in several cases, and they remained in effect until the end of the war.

Which Event Prompted the Harshest Crackdowns on Free Speech Since