<Tr> <Td> Deaths: 4 Injuries: 70 + Arrests: 100 + </Td> <Td> Deaths: 7 Injuries: 60 </Td> </Tr> <Tr> <Td_colspan="2"> Haymarket square, Chicago, Illinois </Td> </Tr> <P> The Haymarket affair (also known as the Haymarket massacre or Haymarket riot) was the aftermath of a bombing that took place at a labor demonstration on Tuesday, May 4, 1886, at Haymarket Square in Chicago . It began as a peaceful rally in support of workers striking for an eight - hour day and in reaction to the killing of several workers the previous day by the police . An unknown person threw a dynamite bomb at police as they acted to disperse the public meeting . The bomb blast and ensuing gunfire resulted in the deaths of seven police officers and at least four civilians; scores of others were wounded . </P> <P> In the internationally publicized legal proceedings that followed, eight anarchists were convicted of conspiracy . The evidence was that one of the defendants may have built the bomb, but none of those on trial had thrown it . Seven were sentenced to death and one to a term of 15 years in prison . The death sentences of two of the defendants were commuted by Illinois governor Richard J. Oglesby to terms of life in prison, and another committed suicide in jail rather than face the gallows . The other four were hanged on November 11, 1887 . In 1893, Illinois's new governor John Peter Altgeld pardoned the remaining defendants and criticized the trial . </P>

Who was involved in the haymarket square riot
find me the text answering this question