With passage of the Third Force Act, popularly known as the Ku Klux Act, Congress authorizes President Ulysses S. Grant to declare martial law, impose heavy penalties against terrorist organizations, and use military force to suppress the Ku Klux Klan (KKK).
Founded in 1865 by a group of Confederate veterans, the KKK rapidly grew from a secret social fraternity to a paramilitary force bent on reversing the federal government's progressive Reconstruction Era-activities in the South, especially policies that elevated the rights of the local African-American population. The name of the Ku Klux Klan was derived from the Greek word kyklos, meaning "circle," and the Scottish-Gaelic word "clan," which was probably chosen for the sake of alliteration. Under a platform of philosophized white racial superiority, the group employed violence as a means of pushing back Reconstruction and its enfranchisement of African-Americans. Former Confederate General Nathan Bedford Forrest was the KKK's first grand wizard and in 1869 unsuccessfully tried to disband it after he grew critical of the Klan's excessive violence.
Most prominent in counties where the races were relatively balanced, the KKK engaged in terrorist raids against African-Americans and white Republicans at night, employing intimidation, destruction of property, assault, and murder to achieve its aims and influence upcoming elections. In a few Southern states, Republicans organized militia units to break up the Klan. In 1871, passage of the Ku Klux Act led to nine South Carolina counties being placed under martial law and thousands of arrests. In 1882, the U.S. Supreme Court declared the Ku Klux Act unconstitutional, but by that time Reconstruction had ended, and the KKK had faded away.