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Strikes call for an eight hour work day for industrial workers.
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In the McCormik Reaper Works factory strike several protestors are killed by police.
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On the evening of May 4th police come to break up a peaceful demonstration at Haymarket Square. A bomb is thrown into the police ranks and police open fire.
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Police arrest anarchists and labor activists.
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The grand jury indict 31 protestors as accsesory to murder eight are chosen to stand trial:Albert Parsons, August Spies, Oscar Neebe, Louis Lingg, George Engel, Adolph Fischer, Michael Schwab, Samuel Fielden.
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The jury convicts most of the suspects in the trial to death.