Private property should mean just that. If you own the property, you should enjoy the reasonable expectation that you are free from government instrutions and that you can keep trespassers from wandering over your property.
Well, not only is that not the case in Pennsylvania, but the Supreme Court ruled in 1975 that property owners are barred from federal courts until they survive a series of expensive, time-consuming procedural traps.
A new law suit seeks to correct this. Read more here.