commissar:
(plural: ‘commissars‘; pronunciation: the letter ‘c’ is said with a ‘k’ sound as in “king” — for the right pronunciation of this word, please click here)
( very rare usage now-a-days) an officer to whom a special duty or responsibility has been given by a superior officer in communist countries;
(also ‘political commissar’) an official of the Communist Party who was given the responsibility of teaching political/party principles to a military unit; and in the USSR, a political minister;
a person/official who tries to control people’s opinion of the government,

a Russian commissar
In those days when USSR was in full swing, some of the best school teachers were turned into commissars to teach communist policies to the general public.
Some of the best commissars led the Red Army of the USSR into battles that showed the strength of Communism to the rest of the world.
There used to be some Americans appointed as commissars in the Baltic region of Russia.
