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.
      If two or more persons conspire to commit any offense named in
    this section, each 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.
      As used in this section, the terms "organizes" and "organize",
    with respect to any society, group, or assembly of persons, include
    the recruiting of new members, the forming of new units, and the
    regrouping or expansion of existing clubs, classes, and other units
    of such society, group, or assembly of persons.