1st of May is the workers' day. It comes to commemorate their victories, and mention the workers (and their employers)  that
the struggle for keeping the workers' rights and their advancement is not finished. This date was chosen as in 1st May 1884 workers' organisations and the American Federation of Labour decided that as of 1st May 1886 the work day will be of eight hours. On 1st May 1886 a strike started in Chicago and all of the United States in this demand. Hundreds of thousands of workers went on a strike. On the 3rd May the police opened fire on demonstrators at McCormick's Harvesters Company, killing one worker. On 4th May a protest was assembled at Haymarket square A bomb was thrown killing twelve, including a policeman. Seven other policemen died from their wounds later. The bomb thrower was not identified. But eight of the organisers were tried and found guilty, and seven were sentenced to death. The trial and the sentenced caused protest around the world. Albert Parsons, August Spies, George Engel and Adolph Fischer were hanged. Louis Lingg commited suicide in his cell with dynamite that was smuggled in

Samuel Filden, Oscar Neebe and Michael Schwab were pardoned by the governor of Illinois. In 1889
the 100th anniversary of the French revolution, the 2nd international decided that 1st of May will be a workers' solidarity day.
The red flag is to remeber the blood that was shed.

August Spies is quoted as having said at his execution: "The time will come when our silence will be more powerful than the voices you strangle today."