So... I follow Buddhism. The best thing is to be at peace with yourself, and accept that no matter what happens, everything is okay. Including death, loss of all material things, loss of sanity, imprisonment, and so on. This goes for yourself and also for your family. Then you become invincible. All of those things become only inconveniences. Sure, it'd not be nice to have them, so you can do something about them, especially your family or loved ones may feel sad more than you, because they may not think like you even if you may come to this kind of thinking.
I know that some people cannot do this and they think it's stupid or impossible, which is fair enough, it's too different from their upbringing and societal conditioning and so on. So let's say you still have chances to be devastated by a few of those things.
Now, let's continue with the assumption that "people in power" have the capacity to watch everyone, including each other. KGB of Chernobyl series style.
You can try to find out, as much as reasonable, what's the actual likelihood of your being affected by a particular thing you may worry about. And, decide, how much that would inconvenience you. Then, you try your reasonable best to reduce the chances of that happening, and also the impacts of it. If it's almost guaranteed to happen, for a moment, pretend that it already has happened. Let the emotions sink in, try to think beyond the emotions. What do you think would be the effects, to you and the people you care about? Can you do anything to reduce those effects? And so on.
It's impractical to do this for "everything that can happen", of course, so you can start with identifying your greatest worries and applying the process for them until your worries about those are reduced enough. And when other worries start surfacing more, apply the same process for them, too.