Night meeting of the Knights of the Ku Klux Klan in Dayton, Ohio on September 21, 1923. The Ku Klux Klan (KKK) was originally founded in 1866, but was disbanded in the years after the Civil War. The Klan arose again in 1915 by the efforts of William Joseph Simmons. This new Klan not only targeted blacks, but Catholics, Jews, and foreigners. During the 1920s, Klan membership increased dramatically. In Ohio, membership is estimated to have reached 300,000. Text at top reads "Knights of the Ku-Klux-Klan --Dayton-O. Sept 21-1923." After a period of decline during the Jim Crow years, the Ku Klux Klan (KKK) emerged again during the 1910s. This reversal was partly due to the Great Migration, when hundreds of thousands of African Americans moved fr...