I won’t say what I think needs to be done with these squatters, but it would only need to be done a handful of times before word got around . . .
Rope, Tree..
Some assembly required..
Lead is simply not that expensive.
My Polish immigrant grandfather — about five foot tall — used to keep order in his bar and grill with a baseball bat and would make rent collections by himself with a large Colt revolver strapped on his hip. Although genuinely kind and generous, he did not permit misconduct and would not be cheated or trifled with.