Since 2010 began, 'sovereign citizens' have shot police officers, flown a plane into an IRS building, and stolen a strip mall. Jared Loughner, the alleged Tuscon shooter, may be an adherent.
David Lynch, head of the racist skinhead group American Front, was shot and killed in his home near Sacramento, Calif., on Wednesday.
Since 9/11, the number of Muslim-American terrorism suspects and perpetrators has averaged about 16 a year. Last year was slightly higher, but way down from 2009.
Officials say security is tighter since last year's Christmas Day bombing attempt aboard an airliner. But there's heightened concern about a terrorist attack during the holidays.
Homegrown militants like Jihad Jane are joining the Islamist terror threat to the US. For some, it's as much about social distress as it is about radical ideology.