A must see

State of Deception: The Power of Nazi Propaganda, an exhibit at the U.S. Holocaust Memorial Museum in Washington, D.C., which "reveals how the Nazi Party used modern techniques as well as new technologies and carefully crafted messages to sway millions with its vision for a new Germany." The exhibit can also be seen online.

From the rise of the Nazis to their fall, from "Dolchstoss" to Nuremberg, the exhibits chill...

In the end many of those responsible were brought to account (see allied poster below, saying "Guilty"), and 'National Socialism' ended up on the scrap heap of history:

Along the same subject, propaganda, this Tweeter highly recommends "Faces of the Enemy: Reflections of the Hostile Imagination" by Sam Keen, which catalogs the ways that "the enemy" are often portrayed in propaganda i.e. as bestial, despoilers (often of the virtue of "our" women), etc. It has numerous examples from history and more recent times. A few examples from WW II are shown below: