Secret Militias on the Rise in U.S.

Study finds increase in anti-government extremist groups.
3:15 | 03/08/12

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Transcript for Secret Militias on the Rise in U.S.
An alarming headline today announcing there is a huge spike in the number of Americans operating in the shadows trying to take down the US government even with violence. A new study finds there are now nearly 1300. Militias and other extremist groups in this country. An increase from 149. Groups in 2008. And what of the fastest growing groups is called sovereign citizens. Tonight ABC's Dan Harris gets a rare look inside their world than this ABC news investigation. -- Sixteen year old Joseph -- emerges from a vehicle and skills to police -- -- Then he and his -- -- white van die in a blaze of bullets in a Wal-Mart parking lot. Joseph stack flies his small plane into an IRS building. -- Austin, Texas and Brody Whitaker leads police on a high speed chase exchanging fire escaping through the woods. I am not American citizen I do not recognize him as president flag. -- -- -- -- -- -- -- All of the members of the sovereign citizens movement estimated at 300000. Strong they believe the laws of America do not apply to them. ABC news was able to get inside this movement starting of all places at this diner near Tampa. Where instead of men and ammo we found a diverse group. Who argued the real threat is not then but the US. Government we are the commanders and the government works for Ross -- -- Google is doing its concentration camps there's like. Hundreds of them and then in convincing. It was it is your view that Google Easter Bunny and -- to most insisted they are nonviolent. But if not all of them ruled it out. I -- you caught me with a bull crap about trying to impress and do. Credit ABC news about how -- I don't give a crap out but anybody they've got to be. -- -- -- about. -- -- sovereigns apart from -- is for the most part they are not using guns but instead -- legal theories. Based on obscure laws the constitution. As well as the Bible all of it used to justify. Flouting the law and avoiding paying their debts and taxes. We travel to Alabama where we met Donald Joseph barber a pastor of a small church in your view. Do you need to have a driver's license growth. What about taxes income tax so. Law enforcement officials fear that as barber and thousands of other sovereigns realize -- -- theories don't fly. They will turn to violence if barber however insists he is is a principal peaceful struggle. Just -- a soldier goes over to a record ran or any other country to fight a battle he's gone over because he loves his country. I can't do -- last. Tuesday your view what you're doing but it entered yes. A -- what -- law enforcement plan to do about this growing number. Quite a bit now the FBI recently came out and said this is a top priority for them. And the Southern Poverty Law Center the group that issued today's report on hate groups. -- recently -- dvd for local law enforcement officials who might encounter severance citizens in the last year alone. They say they got Nunn. Thousand requests for that -- from cops all over the country.

This transcript has been automatically generated and may not be 100% accurate.

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