126 of the district’s 658 schools are charter schools.  Charters can employ non-union teachers, and the CTU has led protests against charter expansion.  None of the four district-recommended charters in “non-priority” areas passed unanimously.

http://www.chicagotribune.com/news/local/breaking/chi-amid-protests-cps-considers-up-to-17-new-charter-schools-20140122,0,1446141.story