In the 1978 case National Labor Relations Board et al. v. Baptist Hospital, Inc., the U.S Supreme Court ruled in favor of the National Labor Relations Board (NLRB). The issue at hand was whether a hospital's refusal to bargain with a union over wages and working conditions for registered nurses violated Section 8(a)(5) and (1) of the National Labor Relations Act, which requires employers to negotiate with employee representatives on such matters. The hospital argued that because registered nurses were "supervisors," they were not covered by these provisions. However, based on its interpretation of amendments made to this act in 1947 and subsequent court decisions, the Supreme Court held that only those who use independent judgment in overseeing other employees are considered supervisors under this law; simply leading others or directing tasks does not qualify an individual as a supervisor for purposes of labor relations law. Therefore, it concluded that refusing to negotiate with nurse representatives constituted an unfair labor practice.

In the dissenting opinion for the case of NATIONAL LABOR RELATIONS BOARD et al. v. BAPTIST HOSPITAL, INC., Justice Powell argued that the majority had misinterpreted and overstepped its bounds in applying Section 8(a)(1) of the National Labor Relations Act (NLRA). He contended that this section was intended to protect employees' rights to organize and bargain collectively, not to guarantee access to union representatives during investigatory interviews. The hospital's refusal to allow a union representative at such an interview did not constitute unfair labor practice as it did not interfere with or restrain any employee rights under NLRA. Furthermore, he criticized the majority’s reliance on Johnnie's Poultry Co., stating it was irrelevant because it dealt with employer interrogation rather than presence of a union representative during an investigation by management into alleged misconduct by an employee.