Mother Jones Senior Editor Shane Bauer went undercover on a mission with a heavily armed militia including members of Colorado's 3UP, the Three Percent United Patriots. This is their camp in Arizona.

Shane Bauer - Mother Jones

The number of armed militias in the United States spiked after the election of the first black president in 2008. These heavily armed civilians are loosely linked by a disdain for the federal government.

Mother Jones Senior Editor Shane Bauer wanted to learn more about the country's paramilitary movement. So he went undercover to the US-Mexico border where he met quite a few Coloradans.  Their militia? The Three Percent United Patriots.

Bauer spoke to CPR's Ryan Warner.