Well this will make things a whole lot easier. From Raw Story:
Terrorists who want to overthrow the United States government must now register with South Carolina's Secretary of State and declare their intentions -- or face a $25,000 fine and up to 10 years in prison.
[...]
There's even a $5 filing fee.
Sure, you might laugh—but this has got to be at least as effective as most of the stuff the TSA does.