PHOTOS: Chicago public school teachers on strike

25 of 73: Elementary drama teacher Mary O'Malley shades herself with an umbrella before joining a large group of public school teachers rallying at John Marshall Metropolitan High School on Wednesday, Sept. 12, 2012 in West Chicago. Teachers walked off the job Monday for the first time in 25 years over issues that include pay raises, classroom conditions, job security and teacher evaluations. (AP Photo/Sitthixay Ditthavong) (AP Photo/ Sitthixay Ditthavong)

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