Founding of the Knights of Labor

During the late 19th century, various labor movements emerged in response to the challenging working conditions and economic inequalities that industrialization created. Among these movements was a significant organization that sought to unite skilled and unskilled workers across different trades to secure better wages and working conditions. This organization aimed to form a single national body of workers that advocated for labor reforms such as the eight-hour workday and the abolition of child labor.

Which labor organization, founded in 1869, played a key role in advocating for workers' rights during this period?