Knights (black tunic with white cross) were establish after the first crusade; they were known for their treatment of the wounded, the elderly, the sick, and the poor; they were also known for treating all individuals, regardless of their religious beliefs.

The knights described in the paragraph are:

- Knights Hospitaller.

Explanation:

The knights hospitaller or the order of knights of the hospital of Saint John of Jerusalem (the principal name but the largest) were knights that swore loyalty only to the Pope, they wore black tunics with an eight peaks white cross (the clothes described in the paragraph) or red tunics with an eight peaks white cross, they were created in the 11th century how a military order to the service of the Catholicism, their first functions were caring the wounded and disabled people, but sometimes were used in the war too.

b. the american revolution

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.