The theories established by Sigmund Freud (1858-1939), the 'Father of Psychoanalysis', opened a chanel to understanding the power of the unconscious mind as being the (secret) seat of all human fear and desire. This fear and desire, residing in the unconscious and often repressed, governs human behavior. Ergo, exploiting these hidden feelings enabled the manipulation of behavior.
Edward Bernays (1891-1995), the grand-daddy of mass manipulation and propaganda and Freud's nephew, most successfully applied Freud's theories. He did so on a large scale and mostly for the benefit of the large corporations and of the politicians who consulted him, including president Eisenhower.
This video documents such mass manipulation accomplished by tapping into human fear. It also extends to the justification of interference in the affairs of foreign nations, all under the guise of preserving American values. In actuality, however, the motives for such interventions were anchored in the safe-guarding of American corporate interests and profiteering.
Brainwashing a Nation by fabricating the 'Communist Threat', the 'Terrorist Threat' and so on
A very recent example of exploiting deep-seated human fear in order to justify political repression, military aggression and outright lies was demonstrated by the "Department of Homeland Security", a creation of president George W. Bush and his henchmen. In and around 2003-2004 the American People were kept in a constant state of fear fuelled by the regular issuance of various levels of "Terror Alerts".
[Also see Unmasking contemporary propaganda]
[More about Bernays' unethical activities: Engineering demand]