Quailman said:
In the book series, The Wheel of Time by Robert Jordan, certain people, called Aes Sedai can channel The One Power to do all sorts of neat and deadly things. But the one in particular I am thinking about is called Compulsion. Using this "weave" (The one power is used by weaving aspects of Fire, Earth, Wind, Water, and Spirit together in different ways to perform different acts) the person using it can make other people do what they want to varying degrees. Most of the time it's seen, it makes people fall into a happy blissful state where they believe and do whatever the person who cast it on them tells them to. One of the villains, Graendal, likes to make entire royal houses her play things. Usually by using so much compulsion that they worship her and become damaged and can never recover.
There are several points in the book series where compulsion is used, often times on the heroines of the book, although it's generally fairly brief. But the idea remains very fun for some fan fiction ideas.
Related to this, in the same series, is the concept of "Turning." People who can channel can, through nefarious means, have their allegiances forcibly shifted from light to dark. However dedicated someone was to light, goodness, justice, etc., is how dedicated they will become to evil, darkness, the evil overlord (AKA the Dark One), etc. after they are Turned. This process is only hinted at in the earlier books, but in the later, there are several minor characters who are Turned, and a few what-if visions of the future in which main heroines are also Turned and made to compete with one another for the Dark One's favor and dominance of the continent.
So far as I remember, this process is irreversible once someone is put through it.
Edit:
There's also a collar and leash-looking type of item. If someone who can channel wears it and the leash is held by someone else, they are forced to channel only when the holder allows them to and unable to resist channelling if the holder wants them to. Actually, the holder can force the person wearing the collar to do (or not do) pretty much anything, not just channel.
This relies on pain and pleasure to get people to act/speak/channel when they're wanted to and the wearers thoughts remain their own, so it's strictly less mind control than Compulsion or Turning, but it is used to seriously psychologically damage some minor characters until they wholeheartedly forfeit their names, identities, and former allegiances in favor of whatever their new masters decree for them. Even when freed, some of these broken characters desperately cling to whatever ideas they were forced to accept when leashed.