Gee, if they didn't know by then they couldn't have been too bright. I've heard that prison camp gossip spreads like wild fire.
...then the iron gates opened and they were free to go.
Why didn't these folks get exterminated? That's not consistent with a "brutal dictator".
Gee, maybe they did not have any specific charges brought against them.
Some Iraqis survived years in the prisons of Saddam Hussein.