Nothing is easier than leading the people on a leash. I just hold up a dazzling campaign poster and they jump right through it.Joseph Goebbels
Aaron Delwiche has this definition of propaganda from Harold Lasswell:
Not bombs nor bread, but words, pictures, songs, parades, and many similar devices are the typical means of making propaganda….propaganda relies on symbols to attain its end: the manipulation of collective attitudes.
Industrial Workers of the World 1911 propaganda poster. PD-US. Pre-dating World War I, this poster is obviously not Nazi propaganda, but it’s an excellent example of propaganda art. Class warfare summarized in images!
Goebbels quote from Nazi Propaganda Posters (4-page PDF).
Aaron Delwiche, World War I > Demons, atrocities, and lies. http://www.propagandacritic.com/articles/ww1.demons.html