Most politically incorrect song?

There was two young blond teen girls in America that came from a very racist background, and they sang very racist songs.
I wouldn't dream of posting their prior stuff here.
They were known as "Prussian Blue" (the colour apparently of Zyklon B, the infamous gas which killed a lot of people during WW2).
The fact that they were extremely very good looking helped their popularity I think - and they were popular amid some circles.

As it turned out, as they grew older, they each in their own way began to see the light of sense and have stopped singing for health reasons and as one said in an interview last year, they no longer thought along the racist lines they were brought up to follow.

Their earlier stuff is still out there being played but I don't think the world will be hearing from them again in racist content or overtones.
They have grown up, are learning to think independently for themselves and are gaining some sense it appears.

A 2011 profile in The Daily describes the twins' rejection of some of their previous politics:
"I’m not a white nationalist anymore," Lamb told The Daily in an exclusive interview, the twins’ first in five years. "My sister and I are pretty liberal now." ... "I’m glad we were in the band," Lynx said, "but I think we should have been pushed toward something a little more mainstream and easier for us to handle than being front-men for a belief system that we didn’t even completely understand at that time. We were little kids."
Despite this, they still made statements skeptical of elements of the Holocaust.

They have a bit to go still but as regards their stronger stuff which their parents it appears, was pushing them to do, that sort of stuff I think they are no longer willing to put into the public domain.
(Thank heavens!)