Who is George Greene from Post Office and what is their importance?

George Greene is described as a croaky-voiced, dull-eyed, wrinkled bachelor in his late 60s. His seniority has earned him an easy route in the rich district, where he regularly blows a whistle to summon children to gather for candy. One day, a new family in the neighborhood accuses him of child molestation. G.G is devastated by the false accusation, and the "good guy" is never seen or mentioned again.