Slavery in Eurasia has been a longstanding economic and social practice that dates back millennia, long before the Eurasian Empire was founded or before the Laurentine Republic first stood. While it existed in a traditional, literal form for many years, the practice of "slavery" was banned in the Eurasian Empire following the Council of Nova Tridentina in 1869. However, the practice of indefinite indentured servitude persists.
Though outlawed, the practice of indentured servitude was not eradicated, and instead flourished. The rules regarding permanent indentured servitude were only applicable to Eurasian citizens and foederati, and non-citizens were bereft of the legal protections thereof. Hence, non-citizens often sell themselves into indentured servitude in order to afford living in Eurasia. Further, indentured servitude of Eurasian citizens is still legal, being that it is not permanent, and there are very little protections that exist for them.
The result of these circumstances is that slavery, while not in a nominal, literal sense, does continue to exist in the form of indentured servitude throughout the Empire. This does not include the Eurasian penal system, which can and does legally employ slave labor.