commissar
noun [ C ] uk/ˌkɒm.ɪˈsɑːr/ us/ˈkɑː.mə.sɑːr/
（1946年以前苏联政府部门的）人民委员;（尤指军队中的）政治委员
(in the Soviet Union until 1946) the official title of the head of a government department, or an official responsible for political education, especially in a military group