FILE - This Sept. 10, 2012 file photo shows Striking Chicago Public School teachers picketing as Mayor Rahm Emanuel visits with students taking part at the Safe Haven program during a teachers strike in Chicago. A threatened strike in 2019 by Chicago teachers would carry on the city's historically significant role in education labor disputes, including the 2012 strike cited by teachers around the country as inspiration for walkouts and other protests in recent years. That seven-day strike was a dramatic test of the Chicago Teachers Union's effort to force expanded negotiations into social issues beyond the typical give-and-take over pay and benefits. (AP Photo/M. Spencer Green, File)
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