To what extent do you find Karl Marx, Sigmund Freud and their ideas represented in 20th and 21st century portrayals of evil?

Marx and Freud

“Vladimir Nabokov said the two great evils of the 20th century were Marx and Freud. He was absolutely correct.” Dean Koontz. To what extent do you find Karl Marx, Sigmund Freud and their ideas represented in 20th and 21st century portrayals of evil?