You're talking about psychological manipulation, behaviorism, conditioning, NLP... that sort of thing? It's not like any of it's secret; it's just fragmented, buried and dismissed by mainstream culture because most people do not want to believe in a lack of independent human will or the idea that core behavior or beliefs can be intentionally manipulated. The idea makes most people so uncomfortable they won't even seriously consider the possibility. However, it seems that good political operatives and marketing people have a pretty good understanding of some parts of it. So do some police and military personnel, especially in other countries (like China) with less interest in ethics or human rights. So do people obsessed with animal training (although that can't use the language part of the equation). So do psychologists, in theory (they should, being psychologists), although most psychologists resort to higher-level therapeutic strategies that are really some suboptimal combination of low level behavior/conditioning/NLP strategies which are primarily what works.