A new report issued by the Southern Poverty Law Center, based in Montgomery AL, documents the continued growth in the number of extremist groups operating in the United States. Mark Potok, a Senior Fellow at the Center, wrote that "the number of hate groups counted by the Southern Poverty Law Center (SPLC) last year reached a total of 1,018, up slightly from the year before but continuing a trend of significant growth that is now more than a decade old. The truly stunning growth came in the antigovernment “Patriot” movement — conspiracy-minded groups that see the federal government as their primary enemy." Overall, the Law Center has documented a total of 1,018 hate groups active in 2011, and 1,274 anti-government 'Patriot' groups also active in 2011.
The Federal Bureau of Investigation (FBI) maintains a web page documenting the history of hate groups and hate crimes in the United States.