The Ku Klux Klan, predominantly in the South, was a native terrorist group that opposed minorities and used tactics to scare and threaten them.
Hey, get over here, black man! You're not welcome here anymore!
The Ku Klux Klan often gathered in meetings to target certain minorities. In the 1920s, the KKK primarily targeted Blacks, immigrants, Catholics, Communists, Jews, and gamblers.
As many Southerners were not ready for such social and political change, the Klan quickly gained a massive following in the 1920s, mostly composed of white Southern Protestants. Even women joined the KKK in the 1920s.
The KKK used flashy parades with stakes, waving flags and rallying songs, such as "One Hundred Percent American" and "The Fiery Cross on High" to attract new members and frighten minorities
The KKK also used cinema to promote their ideals. In 1915, they released one of the first full-length films, The Birth of a Nation, which criticized black people and praised the KKK.
Fortunately, the KKK fell apart in the late 1920s. Following its downfall, many attempts for civil rights legislation were made, unfortunately mostly unsuccessfully. The largest Civil Rights Act was not passed until 1964.