What is the role of unions in a capitalist system?

6
History
Choose from the two following questions. Be very clear and concise. Don’t go over two pages. You may use any source to help you answer the question, but you must cite from Zinn.
1. What is the role of unions in a capitalist system? (You might want to compare and contrast the 19th century models such as the Knights of Labor, the American Railway Union, and the AFofL.)
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