We preview tonight's American Experience documentary "Klansville U.S.A" which examines the unexpected resurgence of the Ku Klux Klan in North Carolina during the 1960's. It was not unexpected for the KKK to surge in popularity as the Civil Rights movement heated up - but it was shocking to see that resurgence occur in the state of North Carolina, which had been long regarded as the most progressive state in the south.