[This is, apparently, not a joke][link]. They actually expect people who are planning to overthrow the US Government to register with them, and pay $5 for the privilege of filling out a form that explains their plans.
Somewhere, Kurt Vonnegut can’t believe this shit.
[link]: http://rawstory.com/2010/02/south-carolinas-subversive-activities-registration-act-force/ “No joke: South Carolina now requires ’subversives’ to register | Raw Story”