Examples of effective campaigns against freedom of expression are the Soviet suppression of genetics research in favor of a theory known as Lysenkoism, the book-burning campaigns of Nazi Germany, the radical anti-intellectualism enforced in Cambodia under Pol Pot, the strict limits on freedom of expression imposed by the Communist governments of the People's Republic of China and Cuba or by right-wing authoritarian dictatorships such as those of Augusto Pinochet in Chile and Francisco Franco in Spain.