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Outraged, people gathered at Haymarket Square the next day, and in the ensuing riot, 12 people were killed, eight of them police officers.

During a rally on May 4 to support workers seeking an eight-hour workday, a pipe bomb exploded in Chicago’s Haymarket Square, panicking both the demonstrators and the police, who opened fire.

In 1886, at Haymarket Square in Chicago, a labor demonstration for an 8-hour work day turned into a deadly riot when a bomb exploded.

When tens of thousands of workers rallied in Haymarket Square in Chicago in support of an eight-hour workday and a bombing killed several policemen, it was German immigrants who were wrongfully accused and ultimately put to death.

The next day, at Haymarket Square, a bomb killed seven police officers and four civilians; four anarchists accused of involvement were later hanged.