The Institute for Justice is a not-for-profit law firm that takes cases to defend ordinary citizens against government overreach in cases dealing with private property rights, free speech, and free enterprise, and similar situations. They have been at the forefront of many high profile cases, several of which have been decided in the Supreme Court of the United States.
This video illustrates one of the cases they have taken on. If you don't think something like this could happen to you...think again.
From the video description:
Imagine you own a million-dollar piece of property free and clear, but then the federal government and local law enforcement agents announce that they are going to take it from you, not compensate you one dime, and then use the money they get from selling your land to pad their budgets—all this even though you have never so much as been accused of a crime, let alone convicted of one.