820 ILCS 405/204
"Employing unit" means any individual or type of organization, including the State of Illinois, each of its political subdivisions and municipal corporations, and each instrumentality of any one or more of the foregoing; and any partnership, association, trust, estate, joint-stock company, insurance company, or corporation, whether domestic or foreign, or the receiver, trustee in bankruptcy, trustee or successor thereof, or the legal representative of a deceased person, which has or subsequent to January 1, 1936, had in its employ one or more individuals performing services for it within this State. All individuals performing services within this State for any employing unit which maintains two or more separate establishments within this State shall be deemed to be employed by a single employing unit for all purposes of this Act.
A talent or modeling agency that is licensed under the Private Employment Agency Act is not the employing unit with respect to the performance of services for which an individual has been referred by the agency.
820 ILCS 405/204