; and (ii) upon intervening— (I) be heard on all matters arising in the civil action; and (II) file petitions for appeal of a decision in the civil action. (3) Investigatory powers Nothing in this subsection may be construed to prevent the attorney general of a State from exercising the powers conferred on the attorney general by the laws of the State— (A) to conduct investigations; (B) to administer oaths or affirmations; or (C) to compel the attendance of witnesses or the production of documentary or other evidence. (4) State coordination with federal trade commission If the Commission institutes a civil action or an administrative action with respect to a violation of subsection (a), the attorney general of a State shall coordinate with the Commission before bringing a civil action under paragraph (1) against any defendant named in the complaint of the Commission for the violation with respect to which the Commission instituted such action. (5) Venue; service of process (A) Venue Any action brought under paragraph (1) may be brought in— (i) the district court of the United States that meets applicable requirements relating to venue under section 1391 of title 28, United States Code; or (ii) another court of competent jurisdiction. (B) Service of process In an action brought under paragraph (1), process may be served in any district in which the defendant— (i) is an inhabitant; or (ii) may be found. (6) Actions by other state officials (A) In general In addition to civil actions brought by attorneys general under paragraph (1), any other officer of a State who is authorized by the State to do so may bring a civil action under paragraph (1), subject to the same requirements and limitations that apply under this subsection to civil actions brought by attorneys general. (B) Savings provision Nothing in this subsection may be construed to prohibit an authorized official of a State from initiating or continuing any proceeding in a court of the State for a violation of any civil or criminal law of the State.