We had this problem a few years ago when I was president of our House Corp. We had one alumni who went nuts after his wife divorced him, and would periodically come by with his hooker girlfriends (seriously
)
He came by the house one weekend (not an alumni function) and they caused so much trouble and damage the chapter called me and asked what to do. I told them to call the cops on him, and then the House Corporation voted at their next meeting to ban him from the house unless he straightened up his act, and then sent him a letter saying so. He never did, most brothers have since banned him from
their own houses.