Despite this legislative and judicial erosion, the employment-at-will rule remains as the background legal doctrine. The legal burden of proof rests with employees who believe that they have been unjustly fired. The employees must prove that they have been fired for an illegal reason and absent such proof, employers are free to dismiss employees at will. The ethical concept of due process, to which we now turn, seeks to reverse this burden of proof. Due pro¬cess would require that employees can be dismissed only for just cause and the burden for establishing this cause rests with the employer. This, then, returns us to the third meaning of a right to work described in the previous section. Once hired, employees have a right to keep their job and can be fired only for good reasons.