Haymarket Riot
Colorized engraving shows a composit scene from the Haymarket Riot, where an initially peaceful labor protester devolved into a full-scale riot following the detonation of a bomb thrown by protestors (seen in the background) and the police response of indiscriminate firing into the largely unarmed (despite this picture's contrary view) crowd, Chicago, Illinois, May 4, 1886. (Photo by Stock Montage/Getty Images)