They make this whole thing much more difficult than it needs to be. Stop already with right wing measures to control a left wing problem, use left wing measures. Left wing people do not like things that damage mother earth, they prefer biodegradable, natural, organic things. So any area with a camp set up is probably causing ecological problems that can also be addressed. load up a half dozen hydro-seeding trucks with a mixture of natural prairie grass seeds and swine farm settling pond fluid. It's quite disgusting. It should serve the same purpose as mace or tear gas or water cannons and re-seed the area for next spring as well. It might take a number of applications for complete coverage. Left wing people should approve of this method better.