Answer:
C) Led to the public outrage over the police firing into a crowd of workers is the correct answer.
Step-by-step explanation:
The Hay market Square riot occurred on May 4, 1886.The Labor rally was organised to protest the killing of labourers at the Mc Cormick reaper works but it turned into a riot when someone threw bomb at police. Eight people died due to the riots and eight radical activists were accused in the connection of bombing. This riot was believed to be a setback for the labour movement in America because they were struggling to get eight hour workday. The men killed in the riot were considered as martyrs. Labour leaders around the world believed that the labourers were convicted unfairly.