The purpose of government agencies is to create and enforce laws like this. They shouldn't be (just) sueing, they should be commanding the power of the law itself to regulate businesses through legislation, enacting crippling fines and exerting control to outright disallow and directly control and prevent this type of thing from happening at all in any area of their jurisdiction.
Oh what's that, you union busted? With MERCENARIES???! All company officers, go directly to federal prison and each personally pay 15x yearly salary+benefits value. Your company must now figure out who to hire into those roles and now do so under the watchful long dick of the law.
No more of this fucking around cost of doing business stuff. Demolish the leaders and the behavior, and "chill" the people thinking about doing the same.