The Sedition Act of 1918 was an amendment to the Espionage Act of 1917 passed at the urging of President Woodrow Wilson, who was concerned that dissent, in time of war, was a significant threat to morale. The passing of this act forbade Americans to use "disloyal, profane, scurrilous, or abusive language" about the United States government, flag, or armed forces during war. The act also allowed the Postmaster General to deny mail delivery to dissenters of government policy during wartime.
________________________________________________________
I thought it could have been helpful during the Vietnam era, and I believe it could be helpful now.