American journalist, author and scholar Diana West, gave a lecture at ICON (Issues Confronting Our Nation) about the history and nature of Political Correctness and its genesis as an expression of Marxism, and met protests by leftists who would seem not to want this information known.
Diana West, author of Death of the Grownup, and American Betrayal, met resistance from leftists on her way to give a lecture on, somewhat ironically, the facts of leftistism's general tendancy to crush freeom of speech and thought.
From Diana's own webpage:
Behold, my own personal protesters (above) in Chapel Hill, North Carolina, snapped en route to the parking lot of a lecture hall where I was to give a speech on October 18. My topic? The origins and impact of the Marxist-Bolshevik-Fabian-Socialist-Democrat-Progessive-Alinskyite-micro-aggression-trigger-warning censorship movement against truth and tradition that is opaquely known as "politically correct."
Diana's write up on the protest is here.
The actual lecture below:
For a 12 minute punchy summary of the Frankfurt School and the history of Political Correctness, please see this Bill Whittle video:
But the Diana West one is much more detailed and explains some of the critical aspects of how it was inserted into the culture so deeply.