Erinyes
A well known story about the Erinyes is that of Orestes. Orestes' mother Klytaimnestra, and her lover Aegisthos, killed Orestes' father Agamemnon. The god Apollo told Orestes to kill the murderers of his father, which he did. Orestes was then pursued by the Erinyes for his crime. With the help of Athena and Apollo Orestes went to a court in Athens. It was decided that Orestes acted correctly and nobody should hurt him. Even the Erinyes accepted the decision, and from then on they were also called Eumenides, which means "the kind ones", because they could also let people go in peace if their crime was done for a good reason.