(65 ILCS 5/4-5-5) (from Ch. 24, par. 4-5-5)
    Sec. 4-5-5. The council has the right and power to appoint and discharge the heads of all principal departments subordinate to the departments provided for in Section 4-5-2. The commissioner of each department, however, may be vested by ordinance with the sole right and power to appoint and discharge the heads of all principal departments subordinate to the department of which he is the commissioner. But in all municipalities which are treated as having adopted or which may hereafter adopt Sections 10-2-1 through 10-2-23, the chief of police and chief of the fire department shall be appointed and discharged only as provided in Sections 10-2-1 through 10-2-23.
(Source: Laws 1961, p. 576.)