“It is elementary that ‘a superior capacity for material production is the necessary basis for a superior cultural superstructure,’” Cannon writes in this 1961 letter. “Even the Cuban leaders, who don’t profess to be practicing Marxists, know that and are working night and day to improve productive capacities to provide the means for all the other things. But in my opinion, there is also merit in [Mills’] concern for ‘moral, cultural, and intellectual superiority,’ because it cannot be taken for granted that this will follow automatically from the reorganization of the productive system. This aim must be deliberately stated and consciously fought for all the time.”