Book excerpt: David Alfaro Siqueiros was perhaps the most important communist painter of the twentieth century. This book, the first sustained engagement with Siqueiros’s work in the English language, focuses on the artist’s late murals, which are both aesthetically innovative and politically provocative. It places Siqueiros in an international context, revealing that the dogmatism he has been charged with was in reality a complex phenomenon. It provided a foundation for – rather than an obstacle to – his efforts to create an art embedded in the day-to-day concerns and theoretical debates of the world-wide mass movement he saw himself as a part of.