The door to Dr. Mousab Azzawi's clinic, on the Mediterranean coast of Syria, was always open to anyone who needed help. But, operating in the heartland of the feared Shabiha militia, there were some patients the doctor would have preferred not to treat. "They were like monsters," said Dr. Azzawi, who worked in Latakia. "They had huge muscles, big bellies, big beards. They were all very tall and frightening, and took steroids to pump up their bodies. I had to talk to them like children, because the Shabiha likes people with low intelligence. But that is what makes them so...