Otto Braun was a German communist journalist and functionary of the Communist Party of Germany with a long and varied career. His most significant role was as a Comintern agent sent to China in 1934 to advise the Chinese Communist Party (CCP) on military strategy during the Chinese Civil War. At the time Braun adopted a Chinese name, Li De. It was only many years later that it became known that Otto Braun and "Li De" were the same person.

Moabit is an inner city locality in the borough of Mitte, Berlin, Germany. As of 2022, about 84,000 people lived in Moabit. First inhabited in 1685 and incorporated into Berlin in 1861, the former industrial and working-class neighbourhood is fully surrounded by three watercourses, which define its present-day border. Between 1945 and 1990, Moabit was part of the British sector of West Berlin and directly bordered East Berlin.