Commissar

Commissar is a name attributed to a government official serving in the country of Russia, and for a time, the greater Soviet Union. The title has been in use since the time of Peter the Great. A political commissar was a high-ranking functionary at a military headquarters who held coequal rank and authority with the military commander of the unit. Political commissars were established to control and improve morale of the military forces by the Communist party.

In television fiction, Commissar is used in programs that usually relate to the Cold War, or other Russian-related matters of the time. The title has also been applied to fictional non-Earth based organizations in the science fiction genre.

Assistant commissar
An assistant commissar is a government official who serves in a commissary and is an assistant to a commissar. Yeah, its pretty self-explanatory that way. Actor Brian Miller played an assistant commissar in the "Horizon" episode of Blake's 7 in 1979.