That is a crime under US law.
EXCERPTED from main part of the Federal Law:
18 USC at 2385 - Advocating overthrow of Government "Whoever knowingly or willfully advocates, abets, advises, or teaches the duty, necessity, desirability, or propriety of overthrowing or destroying the government of the United States.. ...Shall be fined under this title or imprisoned not more than twenty years, or both, and shall be ineligible for employment by the United States or any department or agency thereof..." http://www.law.cornell.edu/uscode/text/1...
You just can’t make this stuff up fast enough. Since 1969,
Cornell never fails to disappoint.