There are more subversive ways folks. Threatening is the last resort. One can always send them a truckload of ripe durians paid and with no return address. Accidents may happen with manure delivery as well as butchery disposal trucks. Stop playing vigilante - go big, go POTUS47-style bombastic pointless and infuriating. They will love that. Send them tons of mail with sugar icing in envelopes. You know...There's no need for violence or petty revenge.