"The powerful have always preyed on the powerless.
prey on somebody's mind: to make somebody think and worry about it all the time ; The thought that he could have helped more preyed on his mind.
Jupiter, displeased at their complaints, sent a Heron, who preyed upon the Frogs day by day, till there were none left to complain.
She used to go round among the families near, and search out their faults, upon which she preyed with all the envy and malice of her nature.
