"..As the military fought fascism in Europe, schools and churches at home emphasized that democracy depended on acceptance of racial, ethnic, and religious differences. Rallies championed diversity, and government-sponsored films warned Americans not to succumb to fascist propaganda. Posters trumpeted slogans such as “Catholics–Protestants–Jews…Working Side By Side…in War and Peace!” and reminded Americans not to “infect” their children “with racial and religious hate.”
In a 1947 radio show, Superman fought a Ku Klux Klan–like gang trying to keep foreign-born players off high school sports teams, and in 1949, comic book artist Wayne Boring portrayed him on a poster urging a group of American schoolchildren to defend their classmates from “un-American” attacks on their race, religion, or ethnicity.."