Gordon Kahl , leader of the sovereign citizen group Posse Comitatus , ambushed .
Gordon Kahl , leader of the sovereign citizen group Posse Comitatus , killed two federal marshals in Medina , North Dakota in 1983 .
Gordon Kahl , leader of the sovereign citizen group Posse Comitatus , ambushed and killed two federal marshals in Medina , North Dakota in 1983 .