The term 'BAD SIDE OF LITERATURE' can be summarized by the crossword solution of 'HYDE', which is a reference to the classic novel 'The Strange Case of Dr. Jekyll and Mr. Hyde' by Robert Louis Stevenson. The novel tells the story of a man who has two sides to his personality, one good and one evil, and explores the idea of the duality of human nature. The 'BAD SIDE of LITERATURE' is thus represented by the character of Mr. Hyde, who is the embodiment of the darker aspects of human nature.