I've tried Thesaurus.com, but it didn't want to cooperate with me. I need a name for a group of fanatic immortals who will do anything, including murder, to prevent any mortals from becoming immortal. (In the story, immortality can be passed from an immortal to a mortal.) I was going to call the fanatics "the Purists", but then I remembered that was the name of the anti-Tenctonese humans in Alien Nation, so I need a different name. Any suggestions?