Garad'kra

The Garad'kra is a militia group that was founded in the wake of the Cataclysm by Garrosh Hellscream who asked the Horde leaders to send their best to serve in the Garad'kra. They were needed to maintain order and would be policing the lands of Kalimdor. Its captains compared the Garad'kra to a spider and his web - if an enemy is near the web, the spider is able to respond quickly.

Shagara is a leader of a group composed of Ironhoof, who acts as a Stone Guard, Ashra Valandril, Felgrim, and Rada'jin. After the death of Rada'jin, Malgar decided to take his place. The first centaur in the Horde, Dorthar, also joined.

Supervisor is Battlemaster Bröng who gave them their first task - to get rid of a new centaur threat.

Speculation
Although no evidence is provided, a fan theory is that the attack on several blue dragons and the subsequent theft of the Focusing Iris was done by the Garad'kra.