Why did John Brown lead the raid on the federal arsenal at Harpers Ferry, Virginia in 18592
Ob
oc
to protest the passage of the Fugitive Slave Act
to inspire Southern slaveholders to resist abolitionists
to protest the use of militia to defend fugitive slave hunters
to inspire an armed uprising of enslaved African Americans

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.