Domestic Terrorist Threat: Background and Issues for Congress [February 19, 2014] [open pdf - 717KB]
From the Summary: "The emphasis of counterterrorism policy in the United States since Al Qaeda's attacks of September 11, 2001 (9/11) has been on jihadist terrorism. However, in the last decade, domestic terrorists--people who commit crimes within the homeland and draw inspiration from U.S.-based extremist ideologies and movements--have killed American citizens and damaged property across the country. Not all of these criminals have been prosecuted under terrorism statutes. This latter point is not meant to imply that domestic terrorists should be taken any less seriously than other terrorists. The Department of Justice (DOJ) and the Federal Bureau of Investigation (FBI) do not officially list domestic terrorist organizations, but they have openly delineated domestic terrorist 'threats.' These include individuals who commit crimes in the name of ideologies supporting animal rights, environmental rights, anarchism, white supremacy, anti-government ideals, black separatism, and anti-abortion beliefs."
CRS Report for Congress, R42536