Note: I put the (?) in the title since I'm only going by the name of the video. You don't actually see anyone clad in a white-sheets and pointy hats. For all I know it could just be supporters of the Rebel/Confederate Flag (since there been such a hullabaloo with that lately).
eta: Okay. The black uniforms. KKK confirmed.
Note 2: If you think people waving the confederate flag are automatically racist then please don't bother replying to this topic.