* on May 3rd 1886, a pitched battle took place between strikers, strikebreakers and police.
* when police fired, several were killed and many injured.
* anarchists of the Black International, a revoluntionary organisation called a meeting in Haymarket Square and the mayor attended and discovered it was peaceful and left.
* someone then threw a bomb that killed a policeman and wounded more than 60 people, 6 of whom died later.
* the police then retaliated, firing into the crowd, wounding more.
* 7 of the anarchists were arrested, tried, found guilty and executed in 1887 and this case was a public sensation at home and abroad.
* once again, organised labour had failed.