Received anonymously:
5 toilets at fast food restuarants rendered inoperable. Plumbers are not cheap. We filled backpacks with small stones, entered the restrooms, and flushed. Purses or shopping bags also work.
This will clog the pipes and they will have to hire a plumber. A quiet easily reproducible act that costs animal abusers lots of money. This tactic can be utilized at any operation serving dead animals