Sadism occupies a densely contested position in the depth-psychology corpus, traversing clinical sexology, character analysis, developmental theory, and social psychology. Freud’s foundational contribution in the Three Essays on the Theory of Sexuality establishes sadism as a component instinct, inseparable from its masochistic complement: the sadist is always simultaneously a masochist, the active and passive aspects of a single perversion. Abraham elaborates this instinctual substrate developmentally, tracing sadism to oral-cannibalistic and anal-muscular sources and locating its peak in what he terms a ‘phase of maximal sadism.’ Klein receives this developmental account and transforms it into the paranoid-schizoid position, where infantile sadism is understood as the projection of the death instinct onto objects, with persecutory anxiety perpetually reinforcing aggressive impulse. Fromm effects the most decisive sociological reorientation: in Escape from Freedom sadism is reconceived not as a fixed perversion but as a character structure — the drive to dominate, exploit, and incorporate — arising from isolation, powerlessness, and thwarted spontaneity, and constitutively fused with masochism in the sado-masochistic authoritarian character. Rank offers a still more archaic reading, anchoring the sadist’s violence in the expulsive hatred of birth trauma. Kalsched, working later, connects Freud’s superego sadism to the self-care system’s diabolical repetitions. Across these positions, the key tensions are: instinct versus character structure; individual pathology versus cultural norm; and domination versus destruction as distinct aims.