If they are not armed, have no hostages, the area was not posted for no trespassing, and if they did not damage any property, then it’s a simple protest.
From what I’ve read so far, this should be treated no different than all the other protesting going on in the nation. If BLM can get by with it, so should this bunch.
Obscure document from the media log looks to be the origin of this: water.
http://www.landrights.org/or/Hammond/Ranchers%20and%20officials%20feud%20over%20water%20rights.docx