To keep a man a slave you do much the same as the cruel...

To keep a man a slave you do much the same as the cruel circus masters did to the elephant around the turn of last century. Clamp heavy chains around their legs and stake them to the ground. Then beat and terrorize them. After a while you no longer even have to stake the chain; the elephant gives up and just the mere rattle of the chain convinces the elephant there is no hope, so they give up and do whatever it is the circus requires.