http://www.splcenter.org/get-informe...4-in-past-year
"...These three strands of the radical right - the hate groups, the nativist extremist groups, and the Patriot organizations - are the most volatile elements on the American political landscape. Taken together, their numbers increased by more than 40 percent, rising from 1,248 groups in 2008 to 1,753 last year..."