In the past, unions have been a force preventing changes in education, rarely letting things deviate from the norm. In the beginning teachers' unions fought for the rights of a mistreated profession, but more recently have defended the legitimacy of No Child Left Behind, prevented teachers from being accountable for their actions and have tied the hands of government officials and school system administrators.
What are your thoughts on the protests (teachers' in particular) in Wisconsin?
Do unions help or hinder education reform? (from What roles do unions play in education and education reform?