425 ILCS 25/8
The Office shall have power in any county in the State of Illinois to summon and compel the attendance of witnesses before it to testify in relation to any matter which is by the provision of this Act a subject of inquiry and investigation, and may require the production of any book, paper or other document it deems pertinent thereto, and it may require the prompt disclosure of the beneficiaries of any trust by the trustee, the disclosure by any named beneficiary of a trust of all persons who have any direct or indirect interest in the trust or who derive any direct or indirect benefit therefrom, the disclosure of a principal by his nominee, and the disclosure by a corporation of each person who holds 5% or more of the shares of stock of the corporation. The Office is hereby authorized and empowered to administer oaths and affirmations to any persons appearing as witnesses before it, and false swearing in any manner or proceeding aforesaid is perjury and shall be punished as such. Any witness who refuses to be sworn, or who refuses to testify, or disclose any information sought by the Office to which it is entitled, or who disobeys any lawful order of the Office, or who fails or refuses to produce any book, paper or other document touching any matter under examination, or who is guilty of any contemptuous conduct after being summoned to appear before the Office to give testimony in relation to any matter or subject under investigation as aforesaid, is guilty of a Class A misdemeanor and it shall be the duty of the State Fire Marshal to make complaint against the person or persons so refusing to comply with the summons or order of the State Fire Marshal, before the circuit court in the county in which the investigation is being had, and upon the filing of such complaint, such cause shall proceed in the same manner as other criminal cases.
425 ILCS 25/8