Page:Glacier Northwest v. Teamsters.pdf/2

2 in other concerted activities for the purpose of collective bargaining or other mutual aid or protection,” 29 U. S. C. §157—at least arguably protected the drivers’ conduct, so the State lacked the power to hold the Union accountable for any of the strike’s consequences. The Washington Supreme Court agreed with the Union, reasoning that “the NLRA preempts Glacier’s tort claims related to the loss of its concrete product because that loss was incidental to a strike arguably protected by federal law.”