Answer:
Powers of the United States Congress are implemented by the United States Constitution, defined by rulings of the Supreme Court, and by its own efforts and by other factors such as history and custom.
I must say, the IV is my favorite amendment: "The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no warrants shall issue, but upon probable cause, supported by oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized"
I mean, while you're at your property, doing your stuff without harming anyone or anything (in theory, if they don't know you're doing it, they'll have to figure it out) the State protects your right to not be disturbed in your privacies, excluding of course, if caught by an authority doing some offence.