820 ILCS 226/10-20

(a) As used in this Section, "interested party" means an organization that monitors or is attentive to compliance with public or worker safety laws. (b) An aggrieved employee, an interested party, or the Department of Labor may bring a civil action against a private employer to enforce any rule adopted by the Department of Labor in accordance with this Act. (c) An action brought under this Section must be brought no later than 3 years after the date of the alleged violation and, if brought by an aggrieved employee, may be brought by one or more employees on behalf of themselves and other employees similarly situated. (d) In any action brought under this Section the Department of Labor shall be represented by the Office of the Attorney General.