Slavery

A slave was an individual forced to complete tasks.

Many species, such as the Ood and Mutos, were forced into slave labour. (DW: Planet of the Ood, Genesis of the Daleks)

Some races, such as the Daleks, altered individuals into becoming slaves. Example of such as the Robomen and New Humans. (DW: The Dalek Invasion of Earth, Daleks in Manhattan)

Humans have regularly been subjugated to slavery. Examples of this are there forced labour in Bedfordshire, the building of the New Time Lord Empire and experimentation by the Daleks. (DW: The Dalek Invasion of Earth, Last of the Time Lords, Daleks in Manhattan) Humans have often enslaved other members of their race. (DW: The Romans)