Before revision:  To paraphrase what has become known as Goodhart 's or Campbell's law: Any proxy measure in a competitive societal system becomes a target for the competing individuals (or groups), promoting corruption of the measure .
After revision:  To paraphrase what has become known as Goodhart, suggesting a general applicability of what is best known as Campbell 's or Campbell's law: Any proxy measure in a competitive societal system becomes a target for the competing individuals (or groups), promoting corruption of the measure .