In Sinclair Lewis's "It Can't Happen Here," the narrative explores the consequences of advocating for political systems like Communism, Socialism, or Anarchism, especially during times of war. Individuals promoting these ideologies face severe legal repercussions, including charges of high treason. The strict penalties for such actions reflect the government's intolerance towards dissent and the extreme measures taken to maintain national unity and loyalty.

The laws outlined in the book establish a harsh framework where advocating for peace or alliances contrary to the war effort can lead to dire consequences, including lengthy prison sentences or execution. This illustrates the lengths to which a government may go to suppress dissent and enforce conformity, ultimately shaping the societal landscape during periods of conflict.