The source of power for manipulators is the ability to operate secretively.
Manipulators must have an environment in which they can count on information not flowing freely between/among others. Their machinations are most effective when they can manage to isolate individuals from one another.
Organizational cultures that value openness, transparency, full disclosure mitigate greatly the ability of manipulators to accomplish their goals.
Think I’ll do what I can to foster that kind of transparent culture where I live and work.