I knew there were secret courts (which are already pretty horrifying in themselves), but the idea that there are secret laws is deeply repugnant to my sense of

I knew there were secret courts (which are already pretty horrifying in themselves), but the idea that there are secret laws is deeply repugnant to my sense of fairness. How can a system of laws be just when the people ruled by it aren't allowed to know all of it? It seems to me that the idea of secret laws is incompatible with the very foundation of liberal democracy.