Via Flickr One of history's most brutal tyrants was a diagnosed schizophrenic on a mission to avenge his childhood years of repressed rage, according to American psychologist and Harvard professor Henry Murray. In 1943, the Office of Strategic Services, a precursor to the CIA, commissioned Murray to study Adolf Hitler's personality to try to predict his behavior. In his 229-page report, "The Personality of Adolf Hitler," Murray described Hitler as a paranoid "utter wreck" who was "incapable of normal human relationships." "It is forever impossible to hope for any mercy or humane treatment from him," Murray wrote.After a frustrating childhood, Hitler felt obligated to exert dominance in all things. Bundesarchiv Hitler suffered from intolerable feelings of inferiority, largely stemming from his small, frail, and sickly physical appearance during his childhood. He refused to go to school because he was ashamed that he was a poor student compared with his classmates. His mother appeased him by allowing him to drop out. "He never did any manual work, never engaged in athletics, and was turned down as forever unfit for conscription in the Austrian Army," Murray writes. Hitler managed his insecurities by worshiping "brute strength, physical force, ruthless domination, and military conquest." Even sexually, Hitler was described as a "full-fledged masochist," who humiliated and abused his partners. Much of his wrath originated from a severe Oedipus complex. Wikipedia/Amanda Macias/Business Insider As a child, Hitler experienced the Oedipus complex (love of mother and hate of father), which he developed after accidentally seeing parents having sex, Murray's report says. Hitler was subservient and respectful to his father but viewed him as an enemy who ruled the family "with tyrannical severity and injustice." According to the report, Hitler was envious of his father's masculine power and dreamed of humiliating him to re-establish "the lost glory of his mother." For 16 years, Hitler did not exhibit any form of ambition or competition, because his father had died and he had not yet discovered a new enemy. Hitler frequently felt emasculated. Bundesarchiv Another blow to Hitler's masculinity: He was "incapable of consummating in a normal fashion," old sexual partners shared with Murray. "This infirmity we must recognize as an instigation to exorbitant cravings for superiority.