Answer:
John Stephens was a state senator for North Carolina, elected mostly by his popularity among black population, mostly. The white community nearly ostricized him, and there was a lot of bad rumors about him created mostly by white male of the Democrats. This made the Ku Klux Klan have "trial" where he could not be and defend himself, and convicted him to death sentence. There were between 8 and 12 men to kill him in a darkened room in the courthouse.
The definition of terrorism being " violence done for political purpose with elements of theater intended to generate drama" explains well why is the KKK terrorist. It was made definetly for political purpose and there is always a hint of theater in all that's done by this group.