Harper Lee influences - KKK

In Go Set A Watchman it looks like Atticus (the father) joined a racist Klan. There where hints in the book to hooded faces and burning crosses and this made me think that it could have been the KKK (Ku Klux Klan). In the 1930/40's they where a white supremacist group that has a string following and would unlawfully attack black people. There attacks included tarring and feathering , in which they would cover a half naked black person in hot tar and place normally chicken feather over them. This was used as a painful act of humiliation.

    The KKK also did the horrific act of lynchings. Some of these would be viewed by thousands of people as public entertainment. Also images where taken of the act and where later sold on like souvenirs. Some of the lynchings where brutal and including not just hanging but in some extremes chopping of fingers and castration.  The Klan is still active today but with a very very small following.