While there are a few groups that call themselves the KKK, as an actual national organization they were gutted by the FBI decades ago. Whenever any self-styled "KKK" group gets large enough, the FBI infiltrates and guts them as well.
It is hard to weed out a general mindset or philosophy entirely, but tearing down organizations is surprisingly easy.
Mind you, there's a downside to that. An FBI that can infiltrate and dismantle the KKK at will can do the same to any legitimate movement for change, like Occupy, etc.
It is hard to weed out a general mindset or philosophy entirely, but tearing down organizations is surprisingly easy.