In 1884, the Federation of Labor in the United States decided that May 1, 1886, would be the day of a strike to demand the establishment of the eight-hour workday.
On May 1, 1886, around half a million people took to the streets across the U.S. with the slogan “8 hours for work, 8 hours for rest, and 8 hours for whatever we want.”
In Chicago, the center of the labor movement in the U.S., violent clashes between protesters and the police lasted for several days, culminating in the bombing at Haymarket Square on May 4, 1886.