The KKK was known as the Invisible Empire and was extremely well organised.
The National leader of the KKK was called the Grand Wizard. It was split into local groups called Klaverns.
Members wore white robes and hoods to hide their identity and had to be American, white, Protestant and at least 16 years old.
During the 1920s, all non-Protestants, new immigrants and black Americans became targets for the Klan. They used a variety of methods to intimidate those they considered inferior.
By 1920, the Klan had started to gain a significant following. There were several reasons for this increased support:
Whites felt they were superior to black immigrants. They were separated into ghetto communities in Northern cities.
There were riots between black and whites in the North and housing conditions were very poor.
Due to the secretive nature of the Klan, it is difficult to know exactly how many men were members.
Estimates have ranged from 3 million to 8 million members in 1924, when the Klan was at its peak.
What is certain however is that the Klan had enough power in the 1920s to hold marches through Washington, DC.
Its influence extended deep into American society. Members included State Governors and Senators, as well as judges, businessmen and members of the police.