Teachers strike in Chicago (20 images)

Members of the Chicago Teachers Union and their supporters hold up a skeleton dressed in graduation attire as they march in front of the Chicago Public Schools headquarters on September 10, 2012 in Chicago. Chicago's 25,000 teachers went on strike Monday for the first time in 25 years after the latest contract talks broke down Sunday night with no deal to avert a walkout. UPI/Brian Kersey

Members of the Chicago Teachers Union and their supporters hold up signs as they march in front of the Chicago Public Schools headquarters on September 10, 2012 in Chicago. Chicago's 25,000 teachers went on strike Monday for the first time in 25 years after the latest contract talks broke down Sunday night with no deal to avert a walkout. UPI/Brian Kersey

A members of the Chicago Teachers Union shouts as she marches through the central business district on September 10, 2012 in Chicago. Chicago's 25,000 teachers went on strike Monday for the first time in 25 years after the latest contract talks broke down Sunday night with no deal to avert a walkout. UPI/Brian Kersey

Members of the Chicago Teachers Union and their supporters march in front of the Chicago Public Schools headquarters on September 10, 2012 in Chicago. Chicago's 25,000 teachers went on strike Monday for the first time in 25 years after the latest contract talks broke down Sunday night with no deal to avert a walkout. UPI/Brian Kersey