Antitrust laws in Montana are  dealt under Chapter Mont. Code, § 30-14-201 et seq, Unfair Trade Practices and Consumer Protection Statute.  According to Section 30-14-223 of the Montana Code, the Department of Justice (Department head is the Attorney General) can institute a proceeding in the competent jurisdiction.  Additionally a private person can bring an action for the recovery of damages pursuant to Mont. Code Anno., § 30-14-222.  In an action brought by a private party other than the department, the prevailing party is entitled to attorney fees and costs.  Claims brought under the Montana Unfair Trade Practices and Consumer Protection Act of 1973 is subject to a two-year limitation period.

Mont. Code Anno., § 30-14-222

A person who is or will be injured or the department may bring an action to enjoin an act that is in violation of 30-14-205 through 30-14-214 or 30-14-216 through 30-14-218 and for the recovery of damages. If the court finds that the defendant is violating or has violated any of the provisions of 30-14-205 through 30-14-214 or 30-14-216 through 30-14-218, the court shall enjoin the defendant. It is not necessary to allege or prove actual damages to the plaintiff.

Mont. Code Anno., § 30-14-223
Upon the violation of any of the provisions of 30-14-205 through 30-14-214 or 30-14-216 through 30-14-218 by any business, the department may institute a proceeding in a court of competent jurisdiction for the forfeiture of the business’s charter, rights, franchises or privileges, and powers exercised by the business and to permanently enjoin it from transacting business in this state.
Mont. Code Anno., § 30-14-222

4. In an action brought by a party other than the department, the prevailing party is entitled to attorney fees and costs.

Mont. Code Anno., § 27-2-211
(1) Within 2 years is the period prescribed for the commencement of an action