Weidenfeld and Nicolson The Cult of Violence: The Untold Story of the Krays by John Pearson - published 2002 ISBN 0752847-94-5 In J.K. Rowling 's Harry Potter series, the main villain, Lord Voldemort is so feared that most wizards and witches refer to him as 'You-Know-Who' or 'He-Who-Must-Not-Be-Named'. According to Rowling, this