FBI warns of threat from anti-government extremists Anti-government extremists opposed to taxes and regulations pose a growing threat to local law enforcement officers in the United States, the FBI warned on Monday. These extremists, sometimes known as "sovereign citizens," believe they can live outside any type of government authority, FBI agents said at a news conference.The extremists may refuse to pay taxes, defy government environmental regulations and believe the United States went bankrupt by going off the gold standard. http://www.reuters.com/article/2012/02/0.....0V20120207