blacks.Early in the twentieth century more than 4 million whites belonged to the Ku Klux Klan.This organization was called the Ku Klux Klan.They wanted to frighten blacks and stop them from voting in elections.Thousands of blacks left the South and moved to Northern cities like Chicago and Detroit.Most blacks were too frightened to tell the police because many policemen in the South actually belonged to the Klan.They also burned the schools, homes, and churches of black people.