Question

How did the Haymarket Riot hurt the labor movement?

Union members became afraid to strike following the violence.
The fires started in the riot destroyed much of Chicago's industrial base.
Many Americans came to believe that union members were violent anarchists.
Key labor leaders were injured in the riot.

Answer 1

On May 4, 1886, a labor protest rally near Chicago's Haymarket Square turned into a riot after someone threw a bomb at police. At least eight people died as a result of the violence that day. Despite a lack of evidence against them, eight radical labor activists were convicted in connection with the bombing.

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Answer 2

Union members became afraid to strike following the violence.

is the answer.

This is from History of America in later part of 19th century. The Haymarket Riot took place on May 4th 1886 at Haymarket Square Chicago, was a result of a peaceful labor demonstration turned chaotic, so union members became afraid to strike following the violence.