A Slave Is a Slave

A Slave Is a Slave is a sci-fi story by H. Beam Piper, published in 1962. A slave based society is taken over by a more substantial power that forbids slavery... But can it simply be eradicated without problems, or is it a far more convoluted matter, rooted inside both the minds of slaves and enslavers? Thought provoking and stimulating food for thought!