I have to disagree with you and Hitler, TC.  I'd suggest that the chief function of propaganda is to make people behave in a desired manner.  Truths and beliefs are not the intended outcomes of propaganda, though both might provide a means to the end.  We are surrounded by propaganda, advertising and in school job counseling to name just two.   
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One book, albeit an old one, that I have found to be useful (especially the references) is Jacques Ellul's book Propaganda: The Formation of Men's Attitudes.
https://en.wikipedia.org/wiki/Propaganda:_The_Formation_of_Men%27s_Attitudes