Abstract
The article poses the need for a historiographical revision on the history of radicalism, trade unionism, and communist activity in Puerto Rico during the 1920‘s and 1930‘s in view of new documentation available in the Comintern archives, located at the Russian State Archive of Social and Political History (RGASPI), in Moscow. It also questions the apparent continuity in the cronology and periodization concerning these issues by suggesting a wider panorama of economic, political, and social developments outside the limits of the island‘s radicalist movement, both at the regional and the international spheres, that may have served as catalysts for local events. The presentation includes a summary of the history of the Comintern archive, useful hints on working with Russian archives, and a complete list of documents on Puerto Rico available at the RGASPI, a short explanation of the content of each file.