Protects free speech
a. article i of the constitution
b. article ii of the constitution
c. article iii of the constitution
d. amendment approval
e. first amendment

They are called independent

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.