Though the protesters claimed to be peaceful and prayerful, this was not the case for many.all of them. They also called North Dakota citizens hateful racists, but some were racist themselves. Their crime included theft, graffitti, online harassment, trespass, destruction of property, assault on law enforcement, inciting riots, possible poaching, and more. Some of the actions at the more violent incursions at Backwater Bridge could be considered domestic terrorism due to the use of incendiary devices (e.g. Molotov cocktails) used or intended to be used against law enforcement.
Backwater Bridge, a small bridge on ND Highway 1806, became an obsessed focal point for the protesters, because it was the only way they could access the private property where the drill pad was. The world saw dramatic footage, framed by protester PR to look as if it was a re-enactment of the civil rights era, of several incidents at the bridge. It looked as if law enforcement were attacking them, but if you review the frontline law enforcement video footage, you'll see that the protesters were the ones doing the attacking and flanking in many of the dramatic images.
During the protest, the farmers and ranchers who lived near the camps saw heavy livestock losses, including cattle, horses, and buffalo. There were also many documented cases of protesters poaching wildlife, in some cases doing so inhumanely (e.g. dragging a deer swimming in the river onto the muddy shore and suffocating it in the mud to kill it). The Fischers, ranchers near the protest camps, had already suffered many losses of their buffalo to protesters and seen their fences cut, animals slaughtered, and chased to their exhaustive deaths.
The Red Warrior Society started out as the Red Warrior Camp. They were responsible for much of the direct action which led to increased police involvement and pulled the protest away from its original peaceful approach. They became such a problem that the tribe asked them to leave before they came to the decision to ask the protesters to leave in whole. Red Warrior Camp became Red Warrior Society, and promised to take their violent actions elsewhere to other protests and situations they deemed appropriate. RWC/RWS was one entity named in the lawsuit that ETP filed in 2017.