I'd call them in for not having orange on the blind. Getting a ticket for that would send a warning shot that you are not going to screw around with them.

That and post one of those bright orange No Trespassing plastic covers that slide over a fence post, about 5 yards on your property right in front of that blind. That is what I did to every fence sitter treestand on the land that I own. Make them stare at a that bright orange sign while they hunt.