The documents of this publication are a relatively complete collection of the most important documents of the Comintern and the Korean communist movement for the period 1918-1941. Most of the archival documents are published for the first time; they make it possible to specifically trace the complex and contradictory history of relations between the Comintern and Korean communist organizations, to assess the position of the Executive Committee of the Comintern on the most important issues of the socio-political struggle in Korea in those years. The book is intended for scientists, students, everyone interested in the history of the labor movement.