That assertion about the KKK is, in fact, a myth. The KKK was founded in 1865, just after the US Civil War, and had as a bedrock principal the re-establishment

That assertion about the KKK is, in fact, a myth. The KKK was founded in 1865, just after the US Civil War, and had as a bedrock principal the re-establishment of white supremacy. It's initial actions were to frustrate Reconstruction-era policies through violent action. Today, they'd be labeled a terrorist organization. Their aims were inherently racist, political and their tactics violent. Through a variety of means, they more or less achieved their goals such that by 1876, the entire south was once again under Democratic control. It wasn't until the revival of the "second wave" of the KKK during 1910's and 1920's that they even started taking on anti-catholic stances. It was during this era that the burning cross, anti-communist, anti-catholic and anti-jewish stances came into being. Finally, I have no idea where you got the idea that the KKK had "many black members". As far as I'm aware, no credible evidence for that has ever been put forward.