What policy did the Knights of Labor promote regarding membership?

The Knights of Labor promoted an open-membership policy, which was a distinctive aspect of the organization compared to many other labor groups of the time. They sought to unite all workers, regardless of their skill level, trade, or background, including women and African Americans, which was quite progressive for the era. This inclusivity was intended to empower workers collectively and address the broader social and economic issues affecting all laborers. By advocating for an open-membership policy, the Knights of Labor aimed to create a large, united front that could effectively push for better working conditions, shorter hours, and fair wages.

The other options reflect more restrictive membership models that would exclude significant segments of the workforce. Exclusively skilled labor would limit the organization to a narrow segment of workers, undermining the Knights' goal of broad-based solidarity. Regional membership would constrain the Knights' ability to mobilize workers nationwide, and membership by invitation only would prevent many workers from joining and diminished the organization's potential strength.