Secondary command structure

As recorded in the Dalek Combat Training Manual, published during the Last Great Time War, the Time Lords identified a secondary command structure within the Dalek hierarchy, which was composed of non-Dalek life forms. A specialist team from the CIA looked into recruiting undercover operatives to infiltrate this secondary command structure.

Scrutinising Dalek history, the Time Lords believed that the unprecedented use of other humanoid species within the Dalek command structure served to overcome the logical impasse which impeded the Daleks during their war against the Movellans. Humanoids were used both directly as Dalek Trooper mercenaries, and indirectly, in the use of young humanoids synced with their battle computers. (PROSE: Dalek Combat Training Manual)

In the period of the Time War where the Daleks were wiped from existence by the War Valeyard. (AUDIO: The War Valeyard) the countless slaves whom the Daleks had conscripted to serve as disposable troops could not remember whom they had been serving under and surrendered (AUDIO: Dreadshade) before the Daleks were restored by the Dalek Time Strategist and a copy of Davros, (AUDIO: Restoration of the Daleks)

Behind the scenes
The Doctor Who Role Playing Game: The Daleks covered the Daleks' "Slave Races". "Below the Soldier Daleks are the races that the Daleks have subjugated. The number of servant races is high, with millions of subjects spread through the continuum. The number varies from planet to planet, with whole world populations being enslaved in some places, and just a handful remaining on others. The slave races are the workers, the ones who build the Dalek ships and equipment, mine needed chemicals, and move the heavy loads. All this is done under the watchful eye of a Dalek, which is ready to exterminate anyone who does not obey."

- The Daleks