Novelist Terry Pratchett once observed of Über-witch Granny (excuse me, Mistress) Weatherwax: “Everyone knows that witches don't have leaders. Granny Weatherwax is the leader the witches don't have.”
In my experience, witches are by and large—like other predators—a competitive lot. That said, in most communities there does tend to be a collectively- (if tacitly-) acknowledged alpha, the Boss Witch, the one that others measure themselves against: the leader the witches don't have. “So, what did you think of the ritual last night, Mistress Weatherwax?”
Until her death in 2004, Serenity de Namaste was the leader the Madison witches didn't have. Like her or not, she was the genuine article, and everyone knew it. Her style of un-leadership was very subtle indeed. To watch her in operation was to learn the art of indirection.