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If you haven't yet watched The Vow, what are you waiting for? HBO's new docuseries takes viewers inside the world of NXIVM, a sex cult and pyramid scheme that operated under the guise of a secretive self-help organisation. Founded by Keith Raniere and Nancy Salzman in 1998, NXIVM first started as a multilevel marketing company that celebrated ideas of female self-empowerment — but, in reality, women in NXIVM were controlled, used, and punished. If you're fascinated by stories of extreme sects and their powerful leaders, then check out the gallery for 15 other true-crime documentaries and docuseries you'll want to watch after The Vow.