Speak to Takata Steelblade in Desolace.
As the Alliance progresses deeper and deeper into Kalimdor, incorrect conclusions may be drawn about the Horde making pacts with the Burning Legion. The Warchief cannot allow that to happen. And with his blessing, I am taking control of overseeing them removed.
I have agents in the area of Desolace at the Ghost Walker Post north of the great Kodo Graveyard. Head south of the Charred Vale in the Stonetalon Mountains and you shall come across it. When you arrive, seek out Takata Steelblade.