Let's not forget, that it's not likely that KKK - which consists of a number of small local groups, with no unified leadership - has a centralized data-base containing all of the personal details of its members. I don't know how exactly Anonymous obtained those names, but it seems many of the people named have social media accounts, promoting white supremacy, or neo-Nazism. And it appears that at least a few of those names are fake.
"The fact that a believer is happier than a skeptic is no more to the point than the fact that a drunken man is happier than a sober one." - George Bernard Shaw
