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

“Vladimir Nabokov said the two great evils of the 20th century were Marx and Freud. He was absolutely correct.” Dean Koontz.

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

The paper should be an argumentative essay and include at least two texts. Texts here include literature, film, television, painting, sculpture, video games, and other works.