Since its birth in the wake of the Civil War, the history of the Ku Klux Klan has been inseparable from that of the United States. From the debates over slavery to the populism of the 1920s, from the struggle for civil rights to the current progress of the far-right, the Klan seems to have always embodied the dark side of America, with its gray areas, its blind spots. The Ku Klux Klan is the oldest terrorist organization in the United States. The secret society founded in 1865 has made headlines for over 150 years; its program, which is characterized by hatred, racism, exclusion and violence, is now being used again across America.