The memorial is a tribute to a great tragedy that happened here, Chicago’s Haymarket produce district in 1886, which had a lot to do with International Worker’s Day and labour movement around the globe.

In an outdoor meeting hastily organized by anarchist activists to protest the violent death of workers during a labor lockout the previous day somewhere else in Chicago, a bomb was thrown into the policemen crowd, resulting seven policemen and four civilian bystanders losing their lives.

Though the real murderers were never found, innocent labor activists were sentenced to death and hanged while one of them died by suicide before his scheduled execution. Politicians and capitalists insisted on this injustice in order to suppress and intimidate workers, which worked for a while before labor movement prevailed permanently in claiming 8-hour work day and many basic labor rights.

You can find plaques on the base of the memorial from different countries and in different languages, forming a testament to the solidarity of workers around the globe fighting for their rights.