It shall be unlawful for any licensee to sell or keep for sale and/or have on his premises for any purpose whatever, any liquor except that purchased from a state liquor store, and any licensee found in possession of, or selling and keeping for sale, any liquor which was not purchased from a state liquor store, shall, upon conviction thereof, be punished as hereinafter provided. If the council shall be satisfied that any such liquor was knowingly sold or kept for sale within the licensed premises by such licensee or by his agents, servants or employees, it shall be mandatory that the council immediately revoke the license of such licensee. (Ord. 50, 4-23-1937)