Finding a violation of the Act when a supervisor mistakenly believed an employee was involved with the union and discharged him "because of his alleged union activities"
In National Labor Relations Board v. Pennsylvania Greyhound Lines, Inc., 303 U.S. 261, 58 S.Ct. 571, 572, 82 L.Ed. 831, 115 A.L.R. 307, three related corporations were involved. The two respondents claimed that the third corporation was the `employer'.