For millions of workers around the world, the first of May is their day. In the late 19th century American Labor Unions were fed up. Fed up with being overworked, in dangerous conditions, and with little pay. So in 1884 the Federation of Organized Trades and Labor Unions met in Chicago and had one major demand an eight-hour workday. And on May 1st 1886, over 300,000 American workers went on strike. Three days later, thousands of strikers met in Haymarket Square where a riot broke out between cops and workers. A bomb was thrown into the crowd killing several people. It was called the Haymarket massacre. And today May 1st is known as International Workers day. While every country's workers have a different history behind May Day, they all commemorate those who have and continue to give their lives for workers' justice.