http://www.catholicworldreport.com/Item/3341/the_labor_movement_teachers_unions_and_catholic_social_teaching.aspx

"While one can laud, for example, the desire and activities of teachers unions that promote students and their families, serve immigrants, and advocate for economic justice, the union leaders and their allies are tragically promoting anti-life and anti-family initiatives as part of their activism. As significant players in public education, they are encouraging cultural perspectives that reject the values of a great number of Americans, including Catholics and other people of good will. This was not always the case in American education and the union movement."