Are unions allowed to sabotage employers?

The Supreme Court ruled 8-1 in Glacier Northwest v. Teamsters that workers are not protected when they deceive employers into making inventory that they intend to ruin. Glacier Northwest sells concrete in Washington state. The company alleged that the Teamsters intentionally called a work stoppage when they knew that the concrete company was in the middle of mixing substantial amounts of concrete, loading batches into ready mix trucks, and making deliveries. Wet concrete has a very short lifespan. What the union drivers did was report for duty and pretend that they would deliver the concrete. This prompted the creation of the perishable product.
There were sixteen drivers that refused to complete their assigned deliveries. Nine of them abandoned their trucks without saying anything. If concrete hardens inside a concrete truck, it causes significant damager.
Over the course of five hours, there was chaos as the employees that did not strike tried to save the trucks and offload the concrete. The trucks were ultimately saved, but all the concrete was lost to waste. The union tried to argue that this act of sabotage was protected.
The US Supreme Court has long held that strikers must take reasonable precautions to protect employer’s property.
Works Cited:
https://www.wsj.com/articles/glacier-northwest-v-teamsters-supreme-court-amy-coney-barrett-union-cement-national-labor-relations-act-889f56e?mod=hp_opin_pos_1
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