The Knights of Liberty (sometimes Liberty Knights, Loyalty Knights, or Knights of Loyalty[1]) was an American volunteer nationalist secret society and vigilance committee active circa 1917–1918, claiming responsibility for violence against perceived disloyalty during World War I. They are known for the 1917 Tulsa Outrage in Oklahoma, the 1918 lynching of Olli Kinkkonen in Minnesota, and a spree of 1918 tarring and feathering events in Wisconsin and California.