"No person shall … be deprived of life, liberty, or property, without due process of law; nor shall private property be taken for public use without just compensation" (Constitution of the United States, Fifth Article of Amendment). The legal definition of "public use" can be very broad. For example, the Pennsylvania Code allows public utility companies to use eminent domain and to delegate the taking to pipeline operators. That means that, under Commonwealth law, a private company can exercise an immense government power!
Anytime you are faced with a "taking" under eminent domain, you need an experienced lawye
"Squatters" are persons who occupy a place without permission. Squatting is based on "adverse possession", an idea which encourages the use of an abandoned property. "Squatter's rights" allow the use of someone else's property if there is no attempt by the owner to get rid of them. You can actually lose ownership of your property to a squatter. To protect your rights, you may need a lawyer, a title agent and a real estate agent; in C. James Vendetti, you have all three.
Squatting is trespassing, which is illegal, but Pennsylvania law on this, like so many