On May 1, 1886, Chicago unionists, reformers, socialists, anarchists, and ordinary workers combined to make the city the center of the national movement for an eight-hour day. Between April 25 and May 4, workers attended scores of meetings and paraded through the streets at least 19 times. On Saturday, May 1, 35,000 workers walked off their jobs. Tens of thousands more, both skilled and unskilled, joined them on May 3 and 4. Crowds traveled from workplace to workplace urging fellow workers to strike. Many now adopted the radical demand of eight hours' work for ten hours' pay. Police clashed with strikers at least a dozen times, three with shootings.

At the McCormick reaper plant, a long-simmering strike erupted in violence on May 3, and police fired at strikers, killing at least two. Anarchists called a protest meeting at the West Randolph Street Haymarket, advertising it in inflammatory leaflets, one of which called for “Revenge!”

The crowd gathered on the evening of May 4 on Des Plaines Street, just north of Randolph, was peaceful, and Mayor Carter H. Harrison, who attended, instructed police not to disturb the meeting. But when one speaker urged the dwindling crowd to “throttle” the law, 176 officers under Inspector John Bonfield marched to the meeting and ordered it to disperse.

Then someone hurled a bomb at the police, killing one officer instantly. Police drew guns, firing wildly. Sixty officers were injured, and eight died; an undetermined number of the crowd were killed or wounded.

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