1918-1919 Commissar of Education, Kazan Education Okrug, then Guberniya. 1919-1920 in Red Army. 1920-1922 in Dept, of Workers’ Faculty, Popular Commissariat of Education.
1922-1929 instructor, then 1929-1944 Professor, Moscow University. 1924-1928 simultaneously instructor, then 1928-1934 Professor, Institute of Red. Professor; since 1929 associate, Communist Academy, then USSR Academy of Science.
1922-1941 member, Editor Board, journal “Pod znamenem marksizma” (Under the Banner of Marxism).