I mean a organisation that controlled several bandit groups or... and made money by using and controlling them??

Did kingdoms of that time created this sort of organisations by themselves to make money or to damage other kingdoms??

Did such organisations controlled some resource points? Like gold mines and... ?

Is that possible?

I'm asking because I want to write a fantasy book and protagonist is going to be leader of such organisation.

What advices do you have for me?

(English is my second language.)