Slavery was a human social-economic system under which certain persons, called slaves, were deprived of personal freedom and compelled to work.
Slaves were held against their will from the time of their capture, purchase or birth, and were deprived of the right to leave, to refuse to work, or to receive compensation in return for their labor. As such, slavery was a form of unfree labor.
The most common form of slavery in the human-settled universe of the Post Diaspora era was the infamous genetic slavery. It was outlawed by most of humanity, but worked as the base of the planet Mesa's economy.
Slavers often raided the countless small colonies in the sphere of space settled by humanity which almost nobody knew about. (CS2)