One of the defining characteristics of fascism is using fear tactics (such as the military or a secret police force) to prevent people from going against the government/leader's beliefs.
Think about the Nazis. They used the military and SS to scare people into agreeing with Hitler, and if they didn't they were threatened with going to a concentration camp, or death.
The Spanish built missions so that they could convert Native Americans to Catholicism. The Spanish and Natives lived and worked in these missions. There were a set of rules, and if the Natives broke them, they would be punished.
