Gypo's can be a total pain, no question of that but I do know of a couple of instances where they have lost when they picked on the wrong persons land. There are a few farmers out there that will happily deal with Gypo's and a few land owners who have 'connections' that make Gypo's look like the Red Cross. I know of 2 excellent cases which involved in one case a special forces ventran and the other a load of diggers where the Gypo's left with their tail between their legs with a clear instruction that if they were seen in the area again they would regret it. Old school methods seem to work best but you need to have the 'talent' to deploy them I suggest.
Having said that to us mere mortals they are a total pain and best left alone as you will loose in the long run.