If the government exists to protect property rights through use of force, and property owners have access to that system without paying taxes, what do you call

If the government exists to protect property rights through use of force, and property owners have access to that system without paying taxes, what do you call the rest of us, who have to pay rents to those property owners and taxes for the government? Not serfs? Even feudal lords had to protect their own land and were also expected to protect their serfs, lest their serfs' foods be given to raiders rather than their lord.