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Überwald League of Temperance
From Discworld & Pratchett Wiki
Times change, even in Überwald. What with advances in communications technology, interfering Witches and the rising influence of Ankh-Morpork, the populace is ever less willing to accept some of the old traditions, such as having the blood drained from their bodies by Vampires. Mobs of peasants and townspeople equipped with torches, pitchforks and sharp wooden stakes have become common around the dark castles of the undead, causing some reflection among thoughtful Vampires. Many of these have concluded that an alternative life style must be found before they are all staked, beheaded, burnt and consigned to running water. (Better communication has spread Vampire remedies, for one thing.)
To promote a healthier, safer modus vivendi, some of them formed the Überwald League of Temperance, a self-help group to encourage each other to abstain from human blood. The League operates as other organisations of the sort, even on Roundworld, offering emotional and practical support to withdrawing Vampires and proselytising among the rest. Lady Margolotta is an early member and a driving force in the movement. Lady Margolotta realised a long time ago that the craving for blood is still only an outward manifestation of something more fundamental still - the craving for power and control. If she can control her fellow vampires through the League, then that's a lot of power in her hands.
Members attend regular meetings and wear a black ribbon to show their affiliation and reassure their human neighbours. The League uses the motto "not one drop" and slogans like "live not in vein." The movement has spread to other regions like Borogravia and the Ankh-Morpork League of Temperance now tends to the needs of the many black-caped immigrants to the city, where people (and particularly the Commander of the Watch) are even less tolerant of the "old ways."

