It's recycled nazi propaganda:
"Cultural Bolshevism (German: Kulturbolschewismus), sometimes referred to specifically as art Bolshevism, music Bolshevism or sexual Bolshevism, was a term widely used by Nazi German-sponsored critics to denounce modernist and progressive movements in the culture... Cultural Marxism is a contemporary variant of the term which is used to refer to the far-right antisemitic Cultural Marxism conspiracy theory. This variant of the term was used by far-right terrorist Anders Breivik in the introductory chapter of his manifesto."