Alas, for it to be effective, it would have to be following the owners and the senior editors, not the foot soldiers. And when they get annoyed, then they call their friends over at the local constabulary, and ask to send some of their ugliest thugs over to crack heads. And since they own the media, who will be the wiser?
Really, the only way to stop these scum is to catch them red handed, like what happened to News of the World.