The legislature made the decision that the supermarket is required to bargain (in good faith) with the union. Not doing so would be "unfair labor practices". Th

The legislature made the decision that the supermarket is required to bargain (in good faith) with the union. Not doing so would be "unfair labor practices". This includes a lot of practices, including not being able to "Lock out employees over a permissive subject of bargaining" or "[...] require agreement on a permissive subject as a precondition to further bargaining" - https://www.nlrb.gov/about-nlrb/rights-we-protect/the-law/bargaining-in-good-faith-with-employees-union-representative https://www.nlrb.gov/about-nlrb/rights-we-protect/the-law/ba...