I don't know where you are from, but in michigan what they are doing is called hunter harrassment. In this state, and being a police officer I know, it is illegal. They could be brought up on misdemeanor charges. What you should do is get some evidence that they are harrassing you. Take pictures of movies. Document all that they are doing. In addition, have the land owner pursue tresspassing charges. Contact their employer, and local law enforcement. I had similar problems in the past and got them worked out that way. Also, if you think they are poaching contact your local DNR or game warden. If the officer is worth his salt he will look into it and start an investigation. Good luck buddy.