10 U.S.C. § 904 : US Code - Section 904: Art. 104. Aiding the enemy

      Any person who - 
        (1) aids, or attempts to aid, the enemy with arms, ammunition,
      supplies, money, or other things; or
        (2) without proper authority, knowingly harbors or protects or
      gives intelligence to, or communicates or corresponds with or
      holds any intercourse with the enemy, either directly or

    shall suffer death or such other punishment as a court-martial or
    military commission may direct. This section does not apply to a
    military commission established under chapter 47A of this title.