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.
The Klan used a variety of methods to intimidate those they considered inferior:
By 1920 the Klan had started to gain a increased support, for a number of reasons:
Due to the secretive nature of the Klan, it was 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.
Members included state governors and senators, as well as judges, businessmen and members of the police.