That's just a very negative way to look at it. If you look at it that way, almost everything is a manipulation of the mind. The mind only thinks about what it is stimulated to - there is literally never a moment when it isn't assailed by sensory information or memories, already "limiting its freedom" to pay attention to that specific thing.
If I smell something good, I get hungry, and start thinking of food. Does that mean the smell
manipulated my mind into thinking of food, limiting my freedom of thought for that moment from everything but food? You
could say yes, but that is a silly choice of words.
However, look at it this way - could I still think of anything else, and be aware that my mind is thinking the way it is? Of course. And in that sense, it isn't being manipulated, necessarily, but consciously driven to that particular thought.
What you're saying is that people have the ability to invoke thoughts in others through communication, and that is true. It's far from manipulation, though - that takes a lot more from circumstance. If you want to be picky, "manipulation" in this context is just a more malicious form of "influencing." It implies what you do is wrong and hurtful, which is only true if you take it to its logical extreme. In truth, communication is just another way to influence the senses, albeit in a more coherent and specific fashion.
And in any case, that leads into what Tsukitty explained
>>15.