The Magnum Crimen is a book about clericalism in Croatia from the end of 19th century until the end of the Second World War. The book, whose full title is Magnum crimen – pola vijeka klerikalizma u Hrvatskoj (The Great Crime – a half-century of clericalism in Croatia), was written by a professor and historian at Belgrade University, Viktor Novak (1889–1977). The book was first published in Zagreb in 1948.Immediately after the book was published, the Roman Curia placed this book on the Index Librorum Prohibitorum and pronounced anathema against the author. Source: Wikipedia (en)