I'm sorry, but if you look around yourself, the word slave is much maligned, depending on where and when you speak of it. Many people in Asia live and work in sweatshops where they barely make enough for food.
Please look at this fascinating train travel Nepal history. It describes a people today that can barely survive. We are all in chains, some are called slaves, others don't have the moniker attached but are worse off. Many in western countries work at minimum wages where if you are late for work you are fired, and while at work have to endure much indignity. Now, a new kind of self-employment has arisen so that companies can get around the minimum wage laws, where people are paid for per item work, yet, do not have enough work to pay for their living expenses.
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You need to look beyond the word to see who is a slave, or worse, while the label is avoided. What is this thing going on, even in the US, with human trafficking?! Labels are words, conditions in reality are what counts.