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 or the government of any State, Territory, District or Possession thereof, or the government of any political subdivision therein, by force or violence, or by the assassination of any officer of any such government; or

Whoever, with intent to cause the overthrow or destruction of any such government, prints, publishes, edits, issues, circulates, sells, distributes, or publicly displays any written or printed matter advocating, advising, or teaching the duty, necessity, desirability, or propriety of overthrowing or destroying any government in the United States by force or violence, or attempts to do so; or

Whoever organizes or helps or attempts to organize any society, group, or assembly of persons who teach, advocate, or encourage the overthrow or destruction of any such government by force or violence; or becomes or is a member of, or affiliates with, any such society, group, or assembly of persons, knowing the purposes thereof—

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, for the five years next following his conviction.

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So, if I understand this right, if I make some offhand comment in a blog-rant such as “it would be desirable to destroy the big-oil sucking US government before it fracks the planet into oblivion” or “it is your duty as a member of a community of caring human beings to overthrow your corporate-controlled city council by violent means if necessary” then I could get 20 years in federal prison?

Well alright then. From now on I will be careful not to advocate the necessity, desirability, or propriety of destroying or disabling the infrastructural support systems of the US government in order to slow its global pointillist drone-strike genocide. And I will be sure never to write about the duty we have as members of the human species to protect and preserve our own habitat even if that means the employment of force and violence targeted directly at governmental institutions and the bureaucratic parasites nestled within.