“[D]iscipline exists outside the ambit of collective bargaining.” Opinion. Firefighters Union sued Denver, claiming new disciplinary rules violated its 1971 collective bargaining agreement (CBA) by altering the terms and conditions of employment. Denver argued the City Charter vested the city with the unilateral right to draft disciplinary rules. The trial court issued injunction, preventing enforcement of the new rules, and the Court of Appeals affirmed, finding the rules to be a term and condition of employment, subject to the agreement. Deciding an issue of first impression, the Colorado Supreme Court held the plain language of the City Charter expressly granted Denver the unilateral right to draft and implement disciplinary rules, and that the rules were not included in the CBA as a term or condition of employment, subject to collective bargaining.