820 ILCS 405/2404
Any employing unit which willfully refuses or fails to pay any contribution, interest or penalties found to be due to the Director by his final determination and assessment, after 30 days' written notice of intent to proceed under this Section, sent by the Director to the employing unit at its last known address by registered or certified mail, may be enjoined from operating any business as an "employer", as defined in this Act, anywhere in this State, while such contribution, interest or penalties remain unpaid, upon the complaint of the Director in the Circuit Court of the county in which the employing unit resides or has or had a place of business within the State. The provisions of this Section shall be deemed cumulative and in addition to any provision of this Act relating to the collection of contributions by the Director.
820 ILCS 405/2404