There were a number of Klans in the US (and still are a few), with very similar "philosophies", but there was never a KKK. There may well have been a group founded by a salesman from or in Ohio. ...the headquarters in a small town being a local barber shop or pool hall sounds about right - the Klan office in Tucker, GA (a suburb of Atlanta) in the late 1970s was upstairs over a laundry. Convenient, eh?