The Single Tax League was a Georgist Australian political party that flourished throughout the 1920s and 1930s based on support for single tax. Based upon the ideas of Henry George, who argued that all taxes should be abolished, save for a single tax on unimproved land values, the Single Tax League was founded shortly after World War I, and a newspaper, the People's Advocate was published. The League had pockets of support throughout Australia but none more than on the west coast of South Australia, whose farmers and graziers saw merit in single tax theory. A great proponent of the theory was J. Medway Day via his short-lived weekly newspaper The Voice.