The origins of “political correctness” or “cultural Marxism” can be found in the early parts of the 20th century from the Frankfurt School, which was the headquarters for the Communists scheming in Germany. Max Horkheimer, T.W. Adorno, Herbert Marcuse, Leo Lowenthal, and Erich Fromm were all there.
The role of the Frankfurt School is creating the victim groups that constitutes the politically correct coalition.
Furthermore, the term was a colloquialism used in the early-to-mid 20th century by Communists and Socialists in political debates, referring pejoratively to the Communist “party line”, which provided for “correct” positions on many matters of politics.
The below video was made by the Free Congress Foundation and narrated by William Lind.