So, the KKK claimed itself to be a "Christian" organization, originally based on a lot of anti-Catholic and obviously anti-Black sentiment. Famously, one of their intimidation techniques was to burn a cross, making others aware of their presence.
This surprises me - that any organization that claimed the name of Christ, no matter how bogus the claim - would do what appears to me to be sacrilege to its most potent symbol. I have heard the claim that the KKK was 'lighting' the cross, not burning it, but that seems a bit of a stretch.
Is there any evidentiary / primary source material that corroborates this explanation, and more importantly, provides some form of theological or biblical justification for the practice?