Yep, you are 💯 correct that this is what they did. Regardless of industry, is why unions are so very important. “At Will” employment is too easily abused, and even if this could somehow be considered a wrongful termination (ANAL, but protesting a company’s social-political viewpoints is not protected like gender, age, race, etc are) it can be costly and time-consuming to fight it in courts by yourself.