Good day! What is the word that describes a person who operates within a specific land or area without the permission of the owner of that area/ land?
In case it might help, here's the background of my question: In our province, we own a land that is mainly used for agricultural purposes, but there is also a group of people who tends to invade it and harvest it for themselves, and planting their own crops there. We legally own the place. Now we want to right a formal letter directly to our central government to request aid for this issue, but we are having a hard time coming up with a word that best describes the situation.