I can imagine unknown forces within a government, but aside, perhaps, from the king of the fairies, what would an unknown government govern?
per your logic...
I'd speculate the (your) unknown/unseen forces within, controlling a government would be able to be controlling whatever it is the visible govt thinks it is governing.
There are many ways by which your imagined unknown forces within a government could hypothetically control people by controlling their visible govt.
BTW when I said in the OP "Which of the world's known governments.." I was thinking something like covert govts could exist within visible ones.
However not necessarily unseen by, or unknown by by the visible govt.
Example:
a) visible govt controlled by blackmail and the governed dont know about it.
b) visible govt unwittingly drugged (or senile)and manipulated by corrupt staff members.
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