18 U.S.C. § 1955 : US Code - Section 1955: Prohibition of illegal gambling businesses

      (a) Whoever conducts, finances, manages, supervises, directs, or
    owns all or part of an illegal gambling business shall be fined
    under this title or imprisoned not more than five years, or both.
      (b) As used in this section - 
        (1) "illegal gambling business" means a gambling business which
          (i) is a violation of the law of a State or political
        subdivision in which it is conducted;
          (ii) involves five or more persons who conduct, finance,
        manage, supervise, direct, or own all or part of such business;
          (iii) has been or remains in substantially continuous
        operation for a period in excess of thirty days or has a gross
        revenue of $2,000 in any single day.

        (2) "gambling" includes but is not limited to pool-selling,
      bookmaking, maintaining slot machines, roulette wheels or dice
      tables, and conducting lotteries, policy, bolita or numbers
      games, or selling chances therein.
        (3) "State" means any State of the United States, the District
      of Columbia, the Commonwealth of Puerto Rico, and any territory
      or possession of the United States.

      (c) If five or more persons conduct, finance, manage, supervise,
    direct, or own all or part of a gambling business and such business
    operates for two or more successive days, then, for the purpose of
    obtaining warrants for arrests, interceptions, and other searches
    and seizures, probable cause that the business receives gross
    revenue in excess of $2,000 in any single day shall be deemed to
    have been established.
      (d) Any property, including money, used in violation of the
    provisions of this section may be seized and forfeited to the
    United States. All provisions of law relating to the seizures,
    summary, and judicial forfeiture procedures, and condemnation of
    vessels, vehicles, merchandise, and baggage for violation of the
    customs laws; the disposition of such vessels, vehicles,
    merchandise, and baggage or the proceeds from such sale; the
    remission or mitigation of such forfeitures; and the compromise of
    claims and the award of compensation to informers in respect of
    such forfeitures shall apply to seizures and forfeitures incurred
    or alleged to have been incurred under the provisions of this
    section, insofar as applicable and not inconsistent with such
    provisions. Such duties as are imposed upon the collector of
    customs or any other person in respect to the seizure and
    forfeiture of vessels, vehicles, merchandise, and baggage under the
    customs laws shall be performed with respect to seizures and
    forfeitures of property used or intended for use in violation of
    this section by such officers, agents, or other persons as may be
    designated for that purpose by the Attorney General.
      (e) This section shall not apply to any bingo game, lottery, or
    similar game of chance conducted by an organization exempt from tax
    under paragraph (3) of subsection (c) of section 501 of the
    Internal Revenue Code of 1986, as amended, if no part of the gross
    receipts derived from such activity inures to the benefits of any
    private shareholder, member, or employee of such organization
    except as compensation for actual expenses incurred by him in the
    conduct of such activity.