Anti-semitism
His first, and prize-winning, novel "Journey to the End of the Night" was noted for anarchist, anticolonialist and antimilitarist themes and its use of spoken, colloquial French as an "extraordinary language, the height of the natural and the artificial". It was followed by vigorously anti-semitic writing pre-, during, and after World War II. He declared himself also profoundly anti-communist. His novels continue to be controversial, and often popular.