Knights of Liberty (vigilante group)

The Knights of Liberty (sometimes Liberty Knights, Loyalty Knights, or Knights of Loyalty) 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. == Background == On April 6, 1917, the United States declared war on the German Empire, entering into World War I. Needing additional manpower to ensure the nation's security domestically and appealing to Americans' sense of volunteerism and "vigilante tradition", President Woodrow Wilson authorized the founding of the semi-official American Protective League that year.

Source: Wikipedia — Knights of Liberty (vigilante group) (CC BY-SA 4.0)