From Mother Jones:
The US law enforcement community regards homegrown violent extremists, not radicalized Islamists, as the most severe threat from political violence in the country, according to a new study from the Triangle Center on Terrorism and Homeland Security. Released late last week, the report comes amid renewed focus on the problem ever since a 21-year-old avowed white supremacist carried out a mass shooting at a historic black church in Charleston, South Carolina. There is a growing body of research highlighting the threat from right-wing extremists, but who or what exactly does that term encompass, and how big really is the problem? Mother Jones examined various reports and contacted experts to find out more.