I think the confusing here is between a “cease and desist letter,” which is a letter can anyone to anyone else warning them that you’ll sue them if they don’t s

I think the confusing here is between a “cease and desist letter,” which is a letter can anyone to anyone else warning them that you’ll sue them if they don’t stop doing something, and an “injunction to cease and desist”. An injunction is a temporary court ruling made on an urgent matter. The NLRB had to show the court that workers would be permanently harmed if they waited till the full lawsuit was over to force Amazon to stop. Cease and desist just means stop, so you can read this as an injunction to stop firing workers for protesting unsafe working conditions. Edit: I missed that this was about safety protests, not unionization.