Given how many African Blacks that Arab (Muslim) slave-traders captured and enslaved and sold untold millions of Blacks to other Arabs, to white slave-shippers, etc.,
Lets not forget:
The european jews financed the slave trade ships.
And the slaves were sold to Christian land owners in America. ..
Spanish Bishop, Bartholomew de Las Casas, 1517. Spanish and Portuguese were the first major slave traders, later the Dutch, French and English
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It is permissible to work a non-Jewish servant harshly. Yet, although this is the law, the way of the pious and the wise is to be compassionate and to pursue justice, not to overburden or oppress a servant, and to provide them from every dish and every drink.
The early sages would give their servants from every dish on their table. They would feed their animals and their servants before sitting to their own meals. Does it not say (Psalms 123:2), "As the eyes of the servant to the hand of his master; as the eyes of the maid to her mistress [so our eyes are towards the L-rd our G-d...]"?
So, too, you should not denigrate a servant, neither physically nor verbally. The Torah made him your servant to do work, not to be disgraced. Do not treat him with constant screaming and anger, rather speak with him pleasantly and listen to his complaints. Such were the good ways in which Job took pride when he said, "Did I ever despise the judgment of my servant and my maid when they argued with me? Did not my Maker make him, too, in the belly; did not the same One form us both in the womb?"
For anger and cruelty are only found among other nations. The children of Abraham, our father--and they are Israel, to whom the Holy One, blessed be He, has provided the goodness of Torah and commanded us righteous judgments and statutes--they are compassionate to all. This is one of the attributes of the Holy One, blessed be He, that we are commanded to emulate (Psalms 145:9): "And He has compassion for all He has made."
Furthermore, all who have compassion will be treated compassionately, as was stated (Deuteronomy 13:18), "He will give you compassion and He will have compassion upon you and multiply you."
(Mishneh Torah, Laws of Indentured Servants, 9:8)<<