IANAL, but I believe the Federal NLRA trumps any state-level at-will provision in much the same way as the EEOC operates. I don't even think formalizing a union

IANAL, but I believe the Federal NLRA trumps any state-level at-will provision in much the same way as the EEOC operates. I don't even think formalizing a union is required, but simply banding together to improve working conditions automatically gives you protected status.