Not deluding History, the fact that successful societies have not dispensed with the presence of slaves, in one form or another, constitutes our starting point. Even after being legally abolished, slavery informally continues to be present among us. Arguably, one who works the whole month in exchange for housing, food and transportation; who is not master of his time and does not accumulate added value from his work, lives in the same conditions of a slave in previous ages. That said, two paths open, each incompatible with the other. There is a possibility that, for the first time in Human History, a legion of artificial slaves will be produced that will free all humans from drudgery and permit a life of greater dignity. However, this is not the only possible path. AI could continue to serve the most powerful, constituting itself as a tool of domination and instate a society of castes in which manufacturers, robot owners and their managerial officers will exercise a power difficult to scrutinize and counter.