Cui bono ("To whose benefit?", literally "[being] good for whom?") is a
Latin adage that is used either to suggest a hidden motive or to indicate that the party responsible for a thing may not be who it appears at first to be. With respect to motive, a public works project which is purported to benefit the city may have been initiated rather to benefit a favored campaign contributor with a lucrative contract.
See more at Wikipedia.org...