References in classic literature ?
Here, he read of dreadful crimes that made the blood run cold; of secret murders that had been committed by the lonely wayside; of bodies hidden from the eye of man in deep pits and wells: which would not keep them down, deep as they were, but had yielded them up at last, after many years, and so maddened the murderers with the sight, that in their horror they had confessed their guilt, and yelled for the gibbet to end their agony.
This bolsters future profitability - they've gotten their arms around costs very well in the past, so this will be a good way to keep them down.