Wis. Stat. § 5.07: Action to compel compliance.

Whenever a violation of the laws regulating the conduct of elections or election campaigns, other than a violation of the laws regulating campaign financing, occurs or is proposed to occur, the attorney general or the district attorney of the county where the violation occurs or is proposed to occur may sue for injunctive relief, a writ of mandamus or prohibition, or other such legal or equitable relief as may be appropriate to compel compliance with the law. No bond is required in such actions.