For this conference, he authored "Left-Wing" Communism: An Infantile Disorder, a short book articulating his criticism of elements within the British and German communist parties who refused to enter their nations' parliamentary systems and trade unions; instead, he urged them to do so to advance the revolutionary cause. The conference had to be suspended for several days due to the ongoing war with Poland, and was relocated to Moscow, where it continued to hold sessions until August.
For this particular event, he wrote "Left-Wing" Communism: An Infantile Disorder, a concise article expressing his criticism of certain elements within the British and German communist parties that refused to participate in their countries' parliamentary systems and trade unions; instead, he advocated for them to join these institutions as a means of advancing the revolutionary cause. The conference was temporarily suspended due to the ongoing war with Poland, and was subsequently relocated to Moscow, where it continued its sessions until August.