Sabina Spielrein

Russian-Jewish psychiatrist who was Jung's patient at the Burghölzli, became his student and briefly his lover, then trained with Freud and became a psychoanalyst herself — contributing the concept of the death drive (Destruktion als Ursache des Werdens) before Freud published it — and was murdered by the Nazis in 1942.

Contributed the concept of the 'destruction drive' — arguing that sexuality contains an innate destructive component oriented toward self-dissolution — which Freud incorporated into Eros and Thanatos, while her relationship with Jung was the precipitating event for the creation of what became a dangerous method: sexual transference.