Amazing insight into what US intelligence knew about Hitler in 1943

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.