I suggest you add information from this article.
http://en.wikipedia.org/wiki/Haymarket_affair#Effects_on_the_labor_movement_and_May_Day
What happened to unions after the protest at Haymarket Square?
My answer: Afterward, the Chicago police arrested hundreds of union leaders, socialists, and anarchists. Opposition to unions increased. The membership in the Knights of Labor dropped, even though that wasn't the union that had called the meeting at Haymarket Square.
5 answers
What do you suggest?
My answer: Afterward, the Chicago police arrested hundreds of union leaders, socialists, and anarchists. Opposition to unions increased. The membership in the Knights of Labor even dropped, leading to labor conflicts growing more bitter. Although, in spite of the opposition to unions, the labor movement did not die. Instead, a new national organization of unions called American Federation of Labor was founded, which focused on improving working conditions.
That's better.
Thank you.