The private prison industry has expanded into immigration detention in return for money and is using the forced labour of their inmates to return a sizeable profit to their shareholders. Is this a justifiable punishment for illegal immigrants making the crossing into the USA, or does it constitute a form of modern-day slavery? This research will determine that through its investigations into deontology, consequentialism, retributivism and anti-foundationalism that the industry is fundamentally founded on concepts that do not relate to justice and so its form of punishment cannot be justified but must rather be considered a form of slavery.