Karl Marx's groundbreaking theories set the stage for sweeping political changes, and his influence on Lenin and Mao Zedong is part of the legacy of the twentieth century. Well over a century after his death, millions follow Karl Marx's social and economic philosophies set forth in his landmark works, The Communist Manifesto and Das Kapital. Now, this easy-to-use, A-Z reference, taken from the great social reformer's own words, defines Marx's terms, concepts, and thinking-from Bourgeois State to Classless Society and Freedom of the Press-and is the perfect introduction to a theorist whose revolutionary views changed the world.