com·mis·sar 
(kŏmĭ-sär′)
(kŏmĭ-sär′)n.
1.
a. An official of the Communist Party in charge of political indoctrination and the enforcement of party loyalty.
b. The head of a commissariat in the Soviet Union until 1946.
2. A person who tries to control public opinion.
[Russian komissar, from German Kommissar, deputy, from Medieval Latin commissārius, agent; see COMMISSARY.]