The Ku Klux Klan was originally focused on maintaining the old racial order in the postwar South, chiefly through the violent suppression of African-Americans. But, in the nineteen-twenties, the Klan was reborn as a nationwide movement targeting not only African-Americans but Jews, Catholics, Muslims, Mexican-Americans, and Asian immigrants. In the jingoistic years following the First World War, the Klan made discrimination the new patriotism. The Bancroft Prize-winning historian Linda Gordon charts this rebirth in “The Second Coming of the KKK.” She writes that millions of people joined the Klan in the span of just a few years, among them mayors, congressmen, senators, and governors; three Presidents were members of the Klan at some point before taking the office. Gordon tells David Remnick that the lessons for our current political moment are sobering.