Who led campaigns to end child labor and increase workplace safety?

Question

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Unions played a significant role in advocating for better working conditions, including the abolition of child labor and increased workplace safety. Through strikes and other collective actions, unions were able to pressure employers and lawmakers to enact reforms. While women's groups and the federal government also played roles in these efforts, unions were the most prominent advocates. Chambers of commerce, by contrast, typically represented the interests of employers and may have opposed some of these reforms.

Who Led Campaigns to End Child Labor and Increase Workplace