FILE - This Feb. 28, 2008 file photo shows visitors at the monument to those killed in the Ludlow Massacre at the site near Ludlow, Colo. Sunday, April 20, 2014 marks the 100th anniversary of the Ludlow Massacre where two women and 11 children were killed in a fire during a battle between striking coal miners and Colorado National Guard. (AP Photo/David Zalubowski, File)
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