On Tyranny by Timothy Snyder

Nastier rulers will use what they know about you to push you around. Scrub your computer of malware on a regular basis. Remember that email is skywriting. Consider using alternative forms of the internet, or simply using it less. Have personal exchanges in person. For the same reason, resolve any legal trouble. Tyrants seek the hook on which to hang you. Try not to have hooks.

WHAT THE GREAT political thinker Hannah Arendt meant by totalitarianism was not an all-powerful state, but the erasure of the difference between private and public life. We are free only insofar as we exercise control over what people know about us, and in what circumstances they come to know it. During the campaign of 2016, we took a step toward totalitarianism without even noticing by accepting as normal the violation of electronic privacy. Whether it is done by American or Russian intelligence agencies, or for that matter by any institution, the theft, discussion, or publication of personal communications destroys a basic foundation of our rights. If we have no control over who reads what and when, we have no ability to act in the present or plan for the future. Whoever can pierce your privacy can humiliate you and disrupt your relationships at will. No one (except perhaps a tyrant) has a private life that can survive public exposure by hostile directive.