Ohio Rev. Code Ann. § 1345.07
(A) If the attorney general, by the attorney general's own inquiries or as a result of complaints, has reasonable cause to believe that a supplier has engaged or is engaging in an act or practice that violates this chapter, and that the action would be in the public interest, the attorney general may bring any of the following:
(2)
(b)
(3) A class action under Civil Rule 23, as amended, on behalf of consumers who have engaged in consumer transactions in this state for damage caused by: