So, what works were on the Catholic Church’s infamous Index Librorum Prohibitorum? Wikipedia has the answers.

The final version (1948) contained around 4,000 works, most of which are extremely obscure. Among the the well-known writers with at least some forbidden works: Pascal, Voltaire, Rousseau, Casanova, Sade, Flaubert, Hugo, Zola,Rabelais, Sartre, Beauvoir, Copernicus, Defoe, Milton, Graham Greene, and Swift. (Obviously, the odds were stacked against the French.)

More surprising are those whoese works who never appeared on the lists: Marx, Darwin, Hitler, Aristophanes, James Joyce, DH Lawrence.