Its origins can be traced back to the late 19th century, when groups of workers began demanding shorter work hours, better wages, and safer working conditions in the United States.
On May 1, 1886, a demonstration involving thousands of workers in Chicago, USA, demanding their rights at work. However, the demonstration ended in violence and several deaths, leading to four labor activists being imprisoned and sentenced to death on charges of committing acts of terrorism.
This event sparked an international labor movement to commemorate the workers' struggle and fight for their rights in the workplace. In 1889, the International Labor Congress in Paris, France, designated May 1 as International Workers' Day or May Day.