The overwhelming majority of them are former military personnel, or were with Savak or other state agencies.
They're actually dangerous people ~
I have known a lot of Iranians. I met a few when I was in the USN back in the mid-seventies, and I went to college with quite a few.
If I had to choose one country over in the Middle East to be allied with (besides Israel) it would be Iran, if only they could get out from under that thugocracy.
I have found them to be smart, practical and in possession of a good sense of humor. To this day, I revile the Carter administration for what it did to the Shah of Iran. He wasn’t perfect, but at least he was attempting to pull Iran out of the 7th Century. And he was succeeding.