Brainwashing
Process in which a group or individual "systematically uses unethically manipulative methods to persuade others to conform to the wishes of the manipulator, often to the detriment of the person being manipulated"
Brainwashing is the controversial theory that purports that the human mind can be altered or controlled against a person's will by manipulative psychological techniques. Brainwashing is said to reduce its subject's ability to think critically or independently, to allow the introduction of new, unwanted thoughts and ideas into their minds, as well as to change their attitudes, values, and beliefs. Wikipedia