Abstract
The article summarizes the preliminary results of a database for the personnel of the Communist International (Comintern) and its agencies in Latin America and the Caribbean, along with members of local radical groups involved in Comintern activities between 1919 and 1943. The study aims to expand the historiographic boundaries of the debate regarding the international communist movement and its influence in Latin America and the Caribbean during the first half of the 20th century, contributing quantitative evidence for some of the most contested issues on the matter, i.e. participation of local radical leaders in international communist agencies, and Soviet control over local radicalism.