This is their last hurrah. Just a bunch of old white guys clamoring for the good ole days. They have no political support, no economical support etc. In 20 years, white/europeans are no longer a majority in the US, but a large minority that will have similar numbers equal to hispanics. The days of white people being 80-90% of the population are gone and will never return. All these guys can do is dress up in the middle of the woods and hang out with the other 20 guys who showed up. The numbers the SLPC mentions just explains how irrelevant they really are in a country of 330 million+.
Fascist groups will probably be the future of organized racist parties in the US, the KKK is too dated.