The Baton Rouge police shooting has focused attention on a little-known political movement that U.S. law enforcement officials say poses a growing threat.
Gavin Long, the former Marine who killed three police officers Sunday, claimed to be a member of the United Washitaw de Dugdahmoundyah Mu’ur Nation, a "sovereign citizen" extremist group whose supporters are black, but whose ideology, ironically, draws from a white supremacist movement of the 1960s.
"The sovereign citizen movement consists of about 300,000 people," said Mark Potok, senior Fellow at the Southern Poverty Law Center. "The vast majority are not members of specific groups, and they've been growing in a huge way since 2008, when Barack Obama was elected president."

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