Our theaters soon became filled with plays portraying the glory of war. Newsreels lost all semblance of objectivity. Newspapers and magazines began to lose advertising if they carried anti-war articles. A smear campaign was instituted against individuals who opposed intervention. The terms “fifth columnist,” “traitor,” “Nazi,” “anti-Semitic” were thrown ceaselessly at any one who dared to suggest that it was not to the best interests of the United States to enter the war. Men lost their jobs if they were frankly anti-war. Many others dared no longer speak. (source)

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[youtube=https://www.youtube.com/watch?v=8TIr1KcaCJ4]Charles Lindbergh’s antiwar speech to the America First Committee

September 11, 1941: Charles Lindbergh’s speech advocating against US involvement in World War II.