Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.A feud is a long-running argument or fight between parties often, through guilt by association, groups of people, especially families or clans. Feuds begin because one party perceives itself to have been attacked, insulted or wronged by another. Intense feelings of resentment trigger the initial retaliation, which causes the other party to feel equally aggrieved and vengeful. The dispute is subsequently fuelled by a long-running cycle of retaliatory violence. This continual cycle of provocation and retaliation makes it extremely difficult to end the feud peacefully. Feuds frequently involve the original parties'' family members and/or associates, can last for generations and may result in extreme acts of violence.