Despite the conclusion by the FBI that the white supremacist acted alone in his massacre of six Sikhs in Oak Creek, Wisconsin last August, an article back in September by the Center for American Progress  suggests that such “lone wolves” are not really so:

Indeed, the lone wolf portrayal of far-right extremism ignores the fact that these alleged loners on the right are actually embedded in networks that do preach violence. While there is no evidence to date of networks that would encourage the type of violence carried out at the Family Research Council this past month, far-right attackers are almost inevitably found to be linked to hate groups—groups which have been on the rise in recent years, partly because of our country’s changing racial and ethnic demographics. In fact, the Southern Poverty Law Center has documented a staggering 70 percent rise in such groups since 2000 alone.

…If social outcasts are now in the business of hearing their views in prominent media outlets, represented by national politicians, and promoted by profitable elements of the music industry, then those who still believe these individuals are loners must subscribe to a completely ungrounded sense of reality.