In my opinion, the term is best restricted to cases where a government or institution is making some judgement about what sort of political opinion is correct. The right doesn’t really use it this way anymore: they want to talk about (to put it charitably) how individuals have political disagreements, which is fine, except that the term is confounding in that context.
Here’s an example of the former usage that I recently came across in the book I’m reading right now:
Joseph Stalin, too, understood the power of words, calling writers “the engineers of the human soul.” The Soviet leader had a way of expressing himself with industrial bluntness. “The production of souls,” he stated, “is more important than the production of tanks.” Stalin engineered a conformity of Soviet thought by executing writers, intellectuals, and artists who did not toe the party line, or by exiling them to the gulag’s frozen extremities.
The CIA’s methods of cultural engineering were far more subtle but no less effective. The agency spent an inestimable fortune on the war of ideas, subsidizing the intellectual and creative labors of those who were deemed politically correct and seeking to marginalize those who challenged the “crackpot realism” of Cold War orthodoxy. The main front organization used by the CIA to spread its largesse and influence was the Congress for Cultural Freedom, “a kind of cultural NATO,” in one critic’s words, founded in 1950 to counter the propaganda efforts of the Soviet bloc. The Congress for Cultural Freedom grew to become one of the biggest arts patrons in world history, sponsoring an impressive array of book publishing start-ups and literary magazines—including the influential Encounter and Paris Review—as well as art exhibits, literary prizes, concert tours, and international conferences held in Paris, Berlin, and the Rockefeller Foundation’s Bellagio retreat overlooking Lake Como.
– David Talbot, The Devil’s Chessboard: Allen Dulles, the CIA, and the Rise of America’s Secret Government
I also quote this because, despite being off topic, I think it’s really interesting historical info! Some of y’all might enjoy checking out this book.