Rallies are held throughout the United States demanding the eight-hour work day, culminating in the <a href="https://en.wikipedia.org/wiki/Haymarket_affair" id="mwmw" rel="mw:WikiLink" title="Haymarket affair">Haymarket affair</a> in <a href="https://en.wikipedia.org/wiki/Chicago" id="mwnA" rel="mw:WikiLink" title="Chicago">Chicago</a>, in commemoration of which May 1 is celebrated as <a href="https://en.wikipedia.org/wiki/International_Workers'_Day" id="mwnQ" rel="mw:WikiLink" title="International Workers' Day">International Workers' Day</a> in many countries.