What is the main criticism of campaigns for third party candidates in us elections?

they take votes away from the larger parties.

they cause greater division on political issues.

they take campaign funds from business.

they build platforms based on single issues.

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.