. . . you'll find a philosophy known as 'Cultural Marxism'. Courtesy of a link at Zero Hedge, here's a short video clip outlining how it works (or, rather, doesn't).
For more information, see the American Thinker article linked above. Also, see the book 'Fools, Frauds and Firebrands: Thinkers of the New Left', an analysis of the main 'thinkers' behind many modern movements.