In Chapter 15 of the novel To Kill a Mockingbird, what does Atticus say about the Ku Klux Klan?

At the beginning of Chapter 15, Sheriff Tate and several other community members visit Atticus Finch's home to talk about the upcoming Tom Robinson trial, and whether or not the Old Sarum bunch will look for any trouble when they move Tom to Maycomb's jailhouse. Jem, Atticus' son, is impatiently watching their discussion through the living room window. When Atticus comes into the house, Jem asks him if the men standing outside were part of a gang. Atticus explains to his son that the men he was talking to were their friends and that there are no gangs in Maycomb. Jem says, "Ku Klux got after some Catholics one time" (Lee 196). Atticus tells Jem that he is confusing that with something else, and that way back in 1920 the Ku Klux Klan existed. Atticus says it was more of a political organization than anything else. Atticus tells Jem that they could not find anyone to scare, so they paraded around Mr. Sam Levy's home one night, and Sam made them ashamed when he commented that he sold them the very sheets on their backs. Atticus concludes by telling Jem that the Ku Klux Klan is gone.