15 U.S.C. § 15 : US Code - Section 15: Suits by persons injured

    (a) Amount of recovery; prejudgment interest
      Except as provided in subsection (b) of this section, any person
    who shall be injured in his business or property by reason of
    anything forbidden in the antitrust laws may sue therefor in any
    district court of the United States in the district in which the
    defendant resides or is found or has an agent, without respect to
    the amount in controversy, and shall recover threefold the damages
    by him sustained, and the cost of suit, including a reasonable
    attorney's fee. The court may award under this section, pursuant to
    a motion by such person promptly made, simple interest on actual
    damages for the period beginning on the date of service of such
    person's pleading setting forth a claim under the antitrust laws
    and ending on the date of judgment, or for any shorter period
    therein, if the court finds that the award of such interest for
    such period is just in the circumstances. In determining whether an
    award of interest under this section for any period is just in the
    circumstances, the court shall consider only - 
        (1) whether such person or the opposing party, or either
      party's representative, made motions or asserted claims or
      defenses so lacking in merit as to show that such party or
      representative acted intentionally for delay, or otherwise acted
      in bad faith;
        (2) whether, in the course of the action involved, such person
      or the opposing party, or either party's representative, violated
      any applicable rule, statute, or court order providing for
      sanctions for dilatory behavior or otherwise providing for
      expeditious proceedings; and
        (3) whether such person or the opposing party, or either
      party's representative, engaged in conduct primarily for the
      purpose of delaying the litigation or increasing the cost
      thereof.
    (b) Amount of damages payable to foreign states and
      instrumentalities of foreign states
      (1) Except as provided in paragraph (2), any person who is a
    foreign state may not recover under subsection (a) of this section
    an amount in excess of the actual damages sustained by it and the
    cost of suit, including a reasonable attorney's fee.
      (2) Paragraph (1) shall not apply to a foreign state if - 
        (A) such foreign state would be denied, under section
      1605(a)(2) of title 28, immunity in a case in which the action is
      based upon a commercial activity, or an act, that is the subject
      matter of its claim under this section;
        (B) such foreign state waives all defenses based upon or
      arising out of its status as a foreign state, to any claims
      brought against it in the same action;
        (C) such foreign state engages primarily in commercial
      activities; and
        (D) such foreign state does not function, with respect to the
      commercial activity, or the act, that is the subject matter of
      its claim under this section as a procurement entity for itself
      or for another foreign state.
    (c) Definitions
      For purposes of this section - 
        (1) the term "commercial activity" shall have the meaning given
      it in section 1603(d) of title 28, and
        (2) the term "foreign state" shall have the meaning given it in
      section 1603(a) of title 28.