Achille Loria's Karl Marx: A Sketch, here presented in an authorized English translation with a foreword by Eden and Cedar Paul, offers a concise but forceful study of the thinker who came to define modern socialism. Structured in five chapters, it traces Marx's ideas from theory to revolution, showing how his work reshaped political and economic thought. At its core is the Communist Manifesto, treated as the essential statement of Marxism: a rejection of idealist and utopian socialism, a claim that history is driven by the means of production, and a conviction that politics, morality, and culture are determined by economic life. The book follows Marx into the upheavals of 1848 and 1849, his journalism for the New Rhenish Gazette, and the persecution that drove him into exile in London. There, amid poverty, family tragedy, and dependence on Engels, he forged his reputation and deepened his revolutionary commitment. As his circumstances improve, he becomes the uncompromising leader of the International, battling rival socialist currents while organizing workers across Europe and America. Alongside this political history, Loria examines Marx's economic analysis, including the struggle over wages and the limits of capitalist prosperity for labor. This edition has been fully restored with modern typesetting, custom cover design.