They can't be shut down. Its against the laws.
Although we did kick their national or world headquarters out of Missouri and they moved to Northern Arkansas.
But every couple of years the KKK wants to 'adopt a highway' which is when organizations want to clean up a mile or two of interstate federal highway to make it look nice, like pick up trash and such. The state lets them put up their sign on the highway and then people start to protest.
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