Thinking about "Mind Control" , Im always reminded of an Australian movie called "Bad Boy Bubby".
Its worth watching. Anyway, Bubby was 30 years old, and he had lived in a locked room in the cellar his entire life. His mother had the key. She was his only source of information and input. She told him how lovely his life was compared to the nightmare that existed outside the door. Painting horrible pictures. Of course he believed her, because what she said was his ONLY frame of reference.
Sums up "mind control" in my book. The situation with bubby is the situation every cult would like to put every member into, if they could.