"nepotism and favouritism are also corruption "justify it​

Corruption is one of the most dangerous core problems of our society which is ruining our nation's future.

Explanation:

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.