The disgusting bias of the major news media in the recent election may give us pause to consider the difference between journalism and propaganda.
Those of a certain age will recall classes in school–yes, public schools–about how Nazis and Communists and other -ists manipulate their messages to mislead the masses. That was during the height of the cold war and was important so the American people could more easily discern truth from error. More recent generations have not been given such information, just as they have long since stopped hiding under desks during air-raid warnings.
In the end, all such tools, just as the -isms which use them, are means to a common end: the exercise of power by one group over another. This was one of the themes of my book, All Enlisted, and is perhaps the dominant theme of all history.
An excellent review of how journalism becomes corrupted follows: