16. Knights of Pythias
The Knights of Pythias was the first fraternal organization to receive a charter under an act of the United States Congress. It was founded by Justus H. Rathbone, who had been inspired by a play by the Irish poet John Banim about the legend of Damon and Pythias. A member must be at least 18 years of age. He cannot be a professional gambler, or involved with illegal drugs or alcohol and he must have a belief in a Supreme Being.
15. Ku Klux Klan
The Ku Klux Klan (KKK), informally known as the Klan, is the name of three distinct past and present far-right organizations in the United States, which have advocated extremist reactionary currents such as white supremacy, white nationalism, and anti-immigration, historically expressed through terrorism. It is classified as a hate group by the Anti-Defamation League and the Southern Poverty Law Center.