Which pagan religions that use the Norse pantheon are racist and which ones aren't?

I always thought pagan groups were kind of like Wicca or witchcraft or something. I thought they were positive and had chosen a pantheon from a particular region or god/goddess to worship and that they cared about the environment, practiced rituals or magick that coincided with nature/seasons, and used their supposed abilities for good things, like healing purposes. Recently, I heard some people saying that some pagan groups are racist/white supremist/neo nazi/ etc., especially if they use the norse pantheon. Is there any truth to that? Which groups or organizations are these? I had always thought of pagan religions as loving, peaceful, and tolerant...