People that work for the government (including teachers) should never be allowed to unionize.
No One should be allowed to unionize. Unions should be Outlawed in America. They destroy our ability to compete.
I don't like unions either. But if you outlaw them, you'll end up outlawing religion, groups like us FReepers and the Boy Scouts (although they are already under attack.)
The First Amendment protects unions, and I can live with that.