The workers in this case, who drive concrete mixers, went out on strike. Drivers allowed Glacier to load their trucks with concrete. At the appointed hour for the strike, several drivers drove their trucks back to Glacier’s headquarters and walked off the job. The company was unable to deliver the concrete and some of it hardened, requiring the company to scramble to find a way to safely dump the concrete, destroy it, and cart it away.

Glacier sued the union in state court for “tortious destruction” of its property – the spoiled concrete. The Washington Supreme Court dismissed the case…

The National Labor Relations Board – the federal agency responsible for enforcing labor law — has long held that unions that fail to take “reasonable precautions” may not be protected by the NLRA when strikes lead to damage to perishable goods or property. The court’s decision on Thursday relied on Glacier’s allegations that the Teamsters purposely timed the strike to ensure that the concrete would harden by choosing to strike only after Glacier had “batched” the wet concrete into the trucks.

Fascinating but I don’t see how that applies here.