How does at-will employment work with union busting? I remember working at Amazon they were very adamant about everything being at-will. Furthermore, in their management training, they didn't even tiptoe around their hatred of unions. They basically have a formal system developed to rat out any union organizers. The only reason I can infer for the existence of such a system is so that they can bust unions. They seem willing to take the legal risks that come with retaliation.