Propaganda is a book written by Edward Bernays in 1928. It incorporated the literature from social science and psychological manipulation into an examination of the techniques of public communication. Bernays wrote the book in response to the success of some of his earlier works such as Crystallizing Public Opinion (1923) and A Public Relations Counsel (1927). Propaganda explored the psychology behind manipulating masses and the ability to use symbolic action and propaganda to influence politics and effect social change. Walter Lippmann was Bernays's unacknowledged American mentor and his work The Phantom Public greatly influenced the ideas expressed in Propaganda a year later. The work propelled Bernays into media historians' view of him as the "father of public relations." (This summary is from Wikipedia.)