820 ILCS 35/3

(820 ILCS 35/3) (from Ch. 10, par. 21)
Sec. 3.
The application shall be signed by the employer or by a majority of
his or her employees in the department of the business in which the controversy
or difference exists, or by both parties, and shall contain a concise
statement of the grievances complained of, and a promise to continue on in
business or at work without any lockout or strike until the decision of
said Department, if it shall be made within 3 weeks of the date of filing
said application. As soon as may be after the receipt of the application
the Department shall cause public notice to be given of the time and place
of the hearing thereon; but public notice need not be given when both
parties to the controversy join in the application and present therewith a
written request that no public notice be given. When such request is made,
notice shall be given to the parties interested in such manner as the
Department may order, and the Department may, at any stage of the
proceedings, cause public notice to be given, notwithstanding such request.
The Department may in all cases summon as witnesses any operative or expert
in the department of business affected, and any person who keeps the
records of wages earned in those departments, or any other person, and
examine them under oath, and require the production of books containing the
records of wages paid, and such other books and papers as may be deemed
necessary to a full and fair investigation of the matter in controversy.
The Department may issue subpoenas, and oath may be administered by the
Director of the Department or by any authorized officer or employee
thereof. If any person, having been served with a subpoena or other process
issued by the Department, shall willfully fail or refuse to obey the same,
or to answer such questions as may be propounded touching the
subject-matter of the inquiry or investigation, the circuit court of the
county in which the hearing is being conducted, upon
application by the Department, duly attested by the Director thereof, shall
issue an attachment for such witness and compel him to appear before the
Department and give his or her testimony, or to produce such books and
papers as may be lawfully required by the Department; and the court may
punish for contempt, as in other cases of refusal to obey the
process and order of such court.
(Source: P.A. 103-154, eff. 6-30-23.)