18 U.S.C. § 606 : US Code - Section 606: Intimidation to secure political contributions

      Whoever, being one of the officers or employees of the United
    States mentioned in section 602 of this title, discharges, or
    promotes, or degrades, or in any manner changes the official rank
    or compensation of any other officer or employee, or promises or
    threatens so to do, for giving or withholding or neglecting to make
    any contribution of money or other valuable thing for any political
    purpose, shall be fined under this title or imprisoned not more
    than three years, or both.