What is "mullahs"

Usage examples of "mullahs".

The stately country homes were taken over, one by one, by Saudi and Kuwaiti royalty, or by the sterner commissars of Democratic Yemen and the nouveau riche mullahs of post-Khomeini Iran.

Emir, too, had succumbed to the scientists and mullahs who told him what he wanted to hear.

Why do we not see anything about, for example, the murderous mullahs, who preach hatred and teach children to kill?