18 U.S.C. § 1962 : US Code - Section 1962: Prohibited activities

      (a) It shall be unlawful for any person who has received any
    income derived, directly or indirectly, from a pattern of
    racketeering activity or through collection of an unlawful debt in
    which such person has participated as a principal within the
    meaning of section 2, title 18, United States Code, to use or
    invest, directly or indirectly, any part of such income, or the
    proceeds of such income, in acquisition of any interest in, or the
    establishment or operation of, any enterprise which is engaged in,
    or the activities of which affect, interstate or foreign commerce.
    A purchase of securities on the open market for purposes of
    investment, and without the intention of controlling or
    participating in the control of the issuer, or of assisting another
    to do so, shall not be unlawful under this subsection if the
    securities of the issuer held by the purchaser, the members of his
    immediate family, and his or their accomplices in any pattern or
    racketeering activity or the collection of an unlawful debt after
    such purchase do not amount in the aggregate to one percent of the
    outstanding securities of any one class, and do not confer, either
    in law or in fact, the power to elect one or more directors of the
    issuer.
      (b) It shall be unlawful for any person through a pattern of
    racketeering activity or through collection of an unlawful debt to
    acquire or maintain, directly or indirectly, any interest in or
    control of any enterprise which is engaged in, or the activities of
    which affect, interstate or foreign commerce.
      (c) It shall be unlawful for any person employed by or associated
    with any enterprise engaged in, or the activities of which affect,
    interstate or foreign commerce, to conduct or participate, directly
    or indirectly, in the conduct of such enterprise's affairs through
    a pattern of racketeering activity or collection of unlawful debt.
      (d) It shall be unlawful for any person to conspire to violate
    any of the provisions of subsection (a), (b), or (c) of this
    section.