15 U.S. Code § 6504 - Actions by States
(a) In general
(1) Civil actions
In any case in which the attorney general of a State has reason to believe that an interest of the residents of that State has been or is threatened or adversely affected by the engagement of any person in a practice that violates any regulation of the Commission prescribed under section 6502 (b) of this title, the State, as parens patriae, may bring a civil action on behalf of the residents of the State in a district court of the United States of appropriate jurisdiction to—
(A) In general
Before filing an action under paragraph (1), the attorney general of the State involved shall provide to the Commission—
(i) In general Subparagraph (A) shall not apply with respect to the filing of an action by an attorney general of a State under this subsection, if the attorney general determines that it is not feasible to provide the notice described in that subparagraph before the filing of the action.
(1) In general
On receiving notice under subsection (a)(2) of this section, the Commission shall have the right to intervene in the action that is the subject of the notice.
(2) Effect of intervention
If the Commission intervenes in an action under subsection (a) of this section, it shall have the right—
For purposes of bringing any civil action under subsection (a) of this section, nothing in this chapter shall be construed to prevent an attorney general of a State from exercising the powers conferred on the attorney general by the laws of that State to—
(d) Actions by Commission
In any case in which an action is instituted by or on behalf of the Commission for violation of any regulation prescribed under section 6502 of this title, no State may, during the pendency of that action, institute an action under subsection (a) of this section against any defendant named in the complaint in that action for violation of that regulation.
(e) Venue; service of process