This FBI page is a surprisingly good place to start.
http://www.fbi.gov/stats-services/publications/law-enforcement-bulletin/september-2011/sovereign-citizens
They could be dismissed as a nuisance, a loose network of individuals living in the United States who call themselves “sovereign citizens” and believe that federal, state, and local governments operate illegally. Some of their actions, although quirky, are not crimes. The offenses they do commit seem minor, like creating false license plates, driver’s licenses, and even currency.
However, a closer look at sovereign citizens’ more severe crimes, from financial scams to impersonating or threatening law enforcement officials, gives reason for concern. If someone challenges (e.g., a standard traffic stop for false license plates) their ideology, the behavior of these sovereign-citizen extremists quickly can escalate to violence. Since 2000, lone-offender sovereign-citizen extremists have killed six law enforcement officers. In 2010, two Arkansas police officers stopped sovereign-citizen extremists Jerry Kane and his 16-year-old son Joseph during a routine traffic stop on Interstate 40. Joseph Kane jumped out of the vehicle and opened fire with an AK-47 assault rifle, killing both officers.
The sovereign-citizen threat likely will grow as the nationwide movement is fueled by the Internet, the economic downturn, and seminars held across the country that spread their ideology and show people how they can tap into funds and eliminate debt through fraudulent methods. As sovereign citizens’ numbers grow, so do the chances of contact with law enforcement and, thus, the risks that incidents will end in violence. Law enforcement and judicial officials must understand the sovereign-citizen movement, be able to identify indicators, and know how to protect themselves from the group’s threatening tactics.
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