The Knights of Labor (labor unions) article
The link address is: https://www.khanacademy.org/humanities/us-history/the-gilded-age/gilded-age/a/the-knights-of-labor
The link address is: https://www.khanacademy.org/humanities/us-history/the-gilded-age/gilded-age/a/the-knights-of-labor