Our economy teacher in high school was obviously an opponent of the Islamic Republic. He often made jokes about the regime in Iran. Once, he told us that the economy lesson will be removed from the school program. We asked him if he would be unemployed and what he would do later. He laughed and said "no, I will work as a religion teacher. I just talk about god and other things I don't believe in".
That teacher is an example for many in Iran, not just for teachers. Some days ago I read that 3 Evin prison guards have been jailed for cooperating with political prisoners, Mohammad Nourizad and Mostafa Tajzadeh. I was not surprised.