Adolf Ioffe (1918) Nikolay Krestinsky (1921–1930) Lev Khinchuk (1930–1934) Yakov Surits (1934–1937) Konstantin Yurenev (1937) Alexey Merekalov (1938–1939) Georgy Astakhov (1939) Alexey Shkvartsev (1939–1940) Vladimir Dekanozov (1940–1941)