The organisation is serving special interests rather than the public. Corruption is a potential problem with all organisations, not just bureaucracies. The very idea of bureaucracy, operating on the basis of merit and defined rules, is intended to overcome the problems of corruption. But often the bureaucracy simply becomes a way to make corruption more efficient. Bureaucracies are based on inequality of power.
Superiors have power over subordinates, and top bureaucrats have power over everyone.
In a system of liberal democracy, government bureaucracies are supposedly accountable to the will of the people via elected officials. But control over actions of bureaucracies by a few officials at the top is difficult. Often it is the top bureaucrats who call the shots. In the case of corporate bureaucracies, there is no formal control over bureaucratic elites at all. Supposedly, the competitive economic system provides some sort of 'market discipline', but this is often an illusion, especially in the case of large corporations.