The Communist Manifesto
Whether you love it or hate it, the political philosophy of this small book has had one of the greatest impacts on human history the world has ever known. Sparking the modern revolutions of world history, the power of its ideas, its words, and its examination of the social hierarchy of proletariat, bourgeoisie, and the aristocratic, "ruling class," make it one of the most well-known and widely read pieces of literature ever printed.