A rebel organization from northern Yemen has occupied the capital and completely changed the political landscape in Yemen. The Husai people participated in the proxy war between Iran and Saudi Arabia, bringing Yemen to the brink of collapse. But who are the Husai people of Yemen? What do they want? How do they control most parts of this country? Safa Al Ahmad of the BBC Arabic Channel spent three months tracking the Hussai people and had special contact with their arch rivals, Sunni tribal leaders, and other fighters loyal to Al Qaeda.