I don't think its a matter of wanting control over your work environment. For me, at least, its a matter of professional decisions (within curriculum guidelines). My principal seems to think that the only thing that matters is that we do it her way and to acknowledge that she is (right or wrong) the boss. She also pits teachers against parents and teachers against teachers.   

I have always worked as a member of a team. Her top-down management style is suffocating us all. I wish she would stick to administrative duties and leave the teaching to us. She siezes on every petty, little error and blows it all out of proportion. She's a power freak.

I could change schools and start over but after 15 years, I think it will be easier to retire.

Yes, I have a union. Unfortunately, the principal does nothing that she isn't allowed to do. Its just that most principals choose not to exercise their power and authority unless absolutely necessary. She doesn't have to be so hyper-vigilant. I think she has a personality disorder but there is nothing I can do about it except stay away from her. She has actually forced me into retirement.