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4. The Rise of the Commissars

From Oxford Dictionaries:

an official of the Communist Party, especially in the former Soviet Union or present-day China, responsible for political education and organization.
"films that are passed by the political commissar"
a head of a government department in the former Soviet Union before 1946.
a strict or prescriptive figure of authority.
"our academic commissars"

Merriam-Webster:
1a: a Communist party official assigned to a military unit to teach party principles and policies and to ensure party loyalty
b: one that attempts to control public opinion or its expression
2: the head of a government department in the Soviet Union until 1946