"But there's another explosive provision in the bill that's received little attention: The bill authorizes state officials to fire any state employee who joins a strike, walk-out, sit-in, or coordinated effort to call in sick." -Mother Jones
Of course, if the courts determine that this bill was "illegally enacted", then, just as before when he fired people, Walker will have cost the Wisconsin double, as all those people will be entitled to back-pay, etc...