42 U.S.C. § 1994 : US Code - Section 1994: Peonage abolished

      The holding of any person to service or labor under the system
    known as peonage is abolished and forever prohibited in any
    Territory or State of the United States; and all acts, laws,
    resolutions, orders, regulations, or usages of any Territory or
    State, which have heretofore established, maintained, or enforced,
    or by virtue of which any attempt shall hereafter be made to
    establish, maintain, or enforce, directly or indirectly, the
    voluntary or involuntary service or labor of any persons as peons,
    in liquidation of any debt or obligation, or otherwise, are
    declared null and void.