N
in the former Soviet Union an official of the Communist Party responsible for political education, esp in a military unit (尤指在前苏联的军事单位)负责政治思想教育的共产党官员 (Also called political commissar)
Alfred Stieglitz (1864-1946) was a major photographer, a pioneering gallery owner, a generous collector, a self-appointed cultural commissar and a compulsive polemicist.