I don't know that much about white supremacy groups, but I wonder how different they are then a street gang? I work in construction and what is sad some of the young people that have worked with me tell me stories of drugs, human trafficking and other gang related stuff. One guy was so funny and always joking around, so I thought the things he was saying were just jokes. But he was in a gang and he and 23 others ended up in prison. Heck, when I was a teenager, that's when the Hippie movement had just started. We all tried pot and LSD. And protested the Vietnam War. We were demonized. Ronald Reagan supposedly had seen a hippie with a sign that said, "Make Love Not War" and said that "by the looks of them, they could do neither." Lots of Hippies ended up in jail for draft evasion and drug charges. We were the enemy. But most hippies hated the "man" the "establishment" the "pigs". So, to us, they were the evil ones. And some hippies became extreme (Manson and his gang) and killed people and some blew up a lab that I think was making napalm.
So how do you stop extremists that resort to killing people? In this case I absolutely support you and other Baha'is... stop racial and religious prejudice. If a religion divides people, get rid of it. Even if that attitude is supported by their Scriptures, then time to update those Scriptures. So go for it Baha'is, bring the different religious people together.