18 U.S. Code § 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"
"or both"
https://www.law.cornell.edu/uscode/text/18/2385
Declaration of Independence
whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it
https://www.archives.gov/founding-docs/declaration-transcript