The idea of a canon might be controversial, but you really can’t go wrong with anything on the list. Although the lack of Marx is questionable considering his immense influence.
Marx was arguably a literary genius in the same way Nietzche was, and influential in the way J.S. Mill was. He should be on the list by both accounts of what the list should contain. Not to mention, Bloom includes many authors who count Marx among their primary influences, like Walter Benjamin, Brecht, Orwell, Levi-Strauss, Sartre, Camus, and Bataille.