Harvard’s Berkman Center had an online class on cybersecurity and internet privacy some years ago, and the resources of the class are still online. It was about how to enhance privacy in an online world, speaking of quaint, with titles of articles like, “Is Big Brother Listening?”
You’ll find all the laws in the US related to privacy and surveillance there. Not that anyone seems to follow any laws that get in their way these days. Or if they find they need a law to make conduct lawful, they just write a new law or reinterpret an old one and keep on going. That’s not the rule of law as I understood the term.