He was the Reichsminister für Volksaufklärung und Propaganda, or Reich Minister for Public Enlightenment and Propaganda, officially.
Before the mid-20^th century, propaganda didn't really have a negative connotation. In part thanks to Nazi Germany, since then it has been associated with manipulating the public, but originally it just meant propagating ideas or agitating the public.
Hi, you may be interested in this previous thread
... and you may find these posts on the more general topic of "propaganda" in WWII interesting
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