Is the deliberate, manipulative style of behavior that uses other individuals for personal gain.

 Machiavellianism is the deliberate, manipulative style of behavior that uses other individuals for personal gain.
According to Machiavelli, Nice guys will finish last.

He focus his study and analysis based on the individuals that managed to achieve the highest position by exploiting other people for their personal gain (Such as ruthless dictators or lying corporates)

You can do

An informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.