Parallel world of Draenor, Gorgrond region.
Slave-catching teams from every corner gathered here, launching a massive slave roundup for the new era. This special high-profit industry chain, which had languished for so long, was rapidly reviving.
Gold, gold, gold! The ugly face of capitalism had been completely exposed. Quite a few Azeroth Orcs were even among the slave-catching teams. They felt no kinship whatsoever toward their counterparts from a parallel world; all they cared about was how much gold they could make.
The New Horde and the Iron Horde had been purchasing Orc slaves from the world of Draenor in massive quantities. They took however many were available, and their acquisitions never ceased.
As for how to train slaves, the Orcs had learned from the humans, picking up an entire set of complete methods from their Human brothers.
These newly arrived slaves would be assigned to crude wooden barracks in concentration camps, where they would perform various daily labor tasks or mining work under military guard. They were also provided with a comprehensive system for advancing their status and reporting others. Once particularly cooperative slaves had been thoroughly trained, developed a sense of identification and belonging—or simply obedience—they would regain their status as free people, formally join the Horde or Iron Horde, and gain eligibility for military service along with all the rights and benefits of other citizens.
Of course, a small portion of the slaves were sold into human society, becoming gladiators raised by nobles of various nations or private bodyguards. This tradition dated back to the Tide of Darkness.
No one protested on behalf of these Orc slaves from a parallel world. Even the Horde could not really say anything about it, since they were doing the same thing themselves. Their own asses were not clean, so how