Three goddesses of vengeance: Tisiphone (avenger of murder), Megaera (the jealous) and Alecto (constant anger). They were also called the Daughters of the Night, but were actally the daughters of Uranus and Gaea. Another name for them is the Erinyes.
Without mercy, the Furies would punish all crime including the breaking of rules considering all aspects of society. They would strike the offenders with madness and never stopped following criminals. The worst of all crimes were patricide or matricide, and first and foremost, the Furies would punish this kind of crime.
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