Holding that union employees' refusal to install third-party manufacturer's product was not prohibited under ยง 158(b)(B), because it was an action "pressuring the [union members'] employer for agreements regulating relations between [the employer] and his own employees"
In Houston Insulation Contractors' Ass'n v. NLRB, 386 U.S. 664, 87 S.Ct. 1278, 18 L.Ed.2d 389 (1967), the Court, relying largely on the reasoning in National Woodwork, held that a work preservation agreement between a company and a local union could be effectuated by another local of the same union.