mandatory subject of bargaining.Labor law. A topic that is required by the National Labor Relations Act to be discussed in good faith by the parties during labor negotiations; an essential employment matter, including wages, hours, and other terms and conditions of employment, about which management and the union are required to negotiate in good faith, and that can lawfully form the basis of a collective-bargaining impasse. 29 USCA § 158(d). — Often shortened to mandatory subject. Cf. PERMISSIVE SUBJECT OF BARGAINING. [Cases: Labor Relations 178. C.J.S. Labor Relations § 155.]

[Blacks Law 8th]