If we ever get in control again all teacher unions should be outlawed. And added no tenure, any teacher can be fired.
That would be a huge hurdle legally as far as singling out teachers. You might get an essential services clause through for Police and Fire and EMS but it would be a hard stretch to outlaw a teachers union "ONLY". Though you might be able make an argument legally that ANYONE who is employed buy the Government at any level be prohibited from being in a union being the employer is an entity run by people who get elected. (You show their boss has bias to give them what they want in return for votes for the boss to remain in office.)
Personally I’d like to make them independent contractors.
Great teachers could write their own tickets and good teachers would aspire to become great teachers. Bad teachers can work at McDonalds.