<P> Knights of Labor (K of L), officially Noble and Holy Order of the Knights of Labor, was the largest and one of the most important American labor organizations of the 1880s . Its most important leaders were Terence V. Powderly and step - brother Joseph Bath . The Knights promoted the social and cultural uplift of the workingman, rejected socialism and anarchism, demanded the eight - hour day, and promoted the producers ethic of republicanism . In some cases it acted as a labor union, negotiating with employers, but it was never well organized, and after a rapid expansion in the mid-1880s, it suddenly lost its new members and became a small operation again . </P> <P> It was founded by Uriah Stephens on December 28, 1869, reached 28,000 members in 1880, then jumped to 100,000 in 1884 . By 1886 20% of all workers were affiliated with the KOL, ballooning to nearly 800,000 members . Its frail organizational structure could not cope as it was battered by charges of failure and violence and calumnies of the association with the Haymarket Square riot . Most members abandoned the movement in 1886 - 87, leaving at most 100,000 in 1890 . Many of them chose to join groups that helped to identify their specific need, instead of the KOL that addressed many different types of issues . Furthermore, the Panic of 1893 terminated the Knights of Labor's importance . Remnants of the Knights of Labor continued in existence until 1949, when the group's last 50 - member local dropped its affiliation . </P> <P> In 1869, Uriah Smith Stephens, James L. Wright, and a small group of Philadelphia tailors founded a secret organization known as the Noble Order of the Knights of Labor . The collapse of the National Labor Union in 1873 left a vacuum for workers looking for organization . The Knights became better organized with a national vision when they replaced Stephens with Terence V. Powderly . The body became popular with Pennsylvania coal miners during the economic depression of the mid-1870s, then it grew rapidly . The KOL was a diverse industrial union open to all workers . The leaders felt that it was best to have a versatile population in order to get points of view from all aspects . The Knights of Labor barred membership from five groups: bankers, land speculators, lawyers, liquor dealers and gamblers . Its members included low skilled workers, railroad workers, immigrants, and steel workers . </P>

When did the knights of labor start and end