David Alfaro Siqueiros was perhaps the most important communist painter of the twentieth century. Mexican muralist, international Marxist is the first book-length treatment in English of the full sweep of Siqueiros's post-1940 murals. Those murals expanded the radical synthesis of politics and aesthetics that Siqueiros had developed in the 1930s. The painter's late works were energetic yet intricate expressions of the communist politics of his day: attuned to the tactical needs of the working-class movement and at the forefront of international communist art. That art, from Mexico to Britain to Italy to the Soviet Union, remained committed to the representation of the human figure, yet used abstraction to render the mechanics of history in a Marxist way and to heighten the emotional effect of scenes depicting the struggles of indigenous freedom fighters, the travails of striking workers, and the suffering of the global proletariat. Siqueiros's murals dovetailed national and international concerns and aimed to foster analysis, articulate political strategy, and provoke emotions. Placing Siqueiros in an international context, Mexican muralist, international Marxist reveals that the dogmatism he has been charged with was in reality a complex phenomenon. It provided a foundation for his efforts to create an art embedded in the worldwide mass movement he saw himself as a part of.