It's not a history you learn about in school—we were whitewashing history long before the current executive orders—but the Klan in the '20s was everywhere. There were millions of Klan members across the country. People joined it like they were joining a golf club or the Elks Lodge. There was a women's auxiliary. There was the Ku Klux Kiddies, for children. Klan rallies were held across the country; thousands would turn up at fairgrounds for the marching bands and cross burnings. In 1925, the Klan even held a march down Pennsylvania Avenue in Washington DC. Tens of thousands strong, crowds were six deep in the streets to watch and cheer. They did it again the next year.