This study of the origins and development of Marxist-Humanism probes the philosophic-organizational labors of Raya Dunayevskaya. Beginning with her work as secretary to Leon Trotsky in exile in Mexico in 1937-38, the book explores her development of state-capitalist theory in the 1940s and her thought-dive into Hegel’s Absolutes in the 1950s. Each of Dunayevskaya’s major works–Marxism and Freedom (1958), Philosophy and Revolution (1973), and Rosa Luxemburg, Women’s Liberation and Marx’s Philosophy of Revolution (1983)–is examined inseparable from the objective world events and revolu-tionary subjectivity that unfolded from the 1940s into the 1980s. The U.S.-Russia super-power rivalry, the Sino-Soviet Conflict, the rise of the Afro-Asian-Latin American and East European revolts and revolutions, together with the Black Di-mension, Women’s Liberation, anti-war youth, and rank-and-file labor struggles in the United States–all in fusion with the re-creation of the Hegelian and Marxian dialectic in the later half of the twentieth century–formed the contours of Dunayevskaya’s labors traced within this new work. Her final, unfinished and unpublished studies on Dialectics of Organization and Philosophy are examined in the concluding part.