It depends on if the people with weapons can find the people with food. With no rule of law, everything is on the table. Warlords still exist in many parts of the world today
Really, modern first-world countries are just the descendants of warlordships that ran out of kingdoms to consolidate with and instead switched to taxation, either relinquishing enough power to their citizens to maintain a stable but effectively symbolic monarchy or overtaxing then losing to a rebellion.