Founded as a secret society in 1869, and elected Terence V. Powderly its leader the following year 1879. Under his leadership, the union announced itself in 1881. One of their strengths was that it was a broad industrial union: all wage workers (skilled, unskilled, women, and minorities) were invited to join. The Knights advocated for both economic and social reforms, such as the development of labor cooperatives, an eight-hour workday, and federal regulation of business. They preferred to use arbitration rather than violent strikes. Entered terminal decline after the Haymarket Square Riot.