So let us go back and establish some historic references. Czar or rather Tsar, is a degradation of the Latin term Ceasar, similar to Germany's Kaiser. Ceasar, originally the family name of one Julious Ceasar, who almost became Rome's first Emperor, before his assassination, lent his family name to the title of Roman emperors.
The first use of the term in Russia was during the reign of Ivan Grozny (Ivan the Feared, which the Anglos mistranslate to "The Terrible") Before this, the term " князь " knyaz or " принц " prince, was used. The Moscow princes, being the new center of the Rus, Kiev being held by Catholic Poles, were called the grand princes (велики князь).
Ivan Grozny got the other princes under his rule, to refer to him as Tsar. They did it to humor their half mad overlord, not realizing the importance of words. Ivan, however, knew their power and that of titles in the human psyche and knew that once the title of Tsar stuck, he and his prodigy would forever be associated as some one absolutely separate and above the regular knyazi: an emperor rather than a challengable grand prince.
Now we forward several hundred years to the Wall Street sponsored Russian Revolution and Civil War and the Marxists take over of Holy Russia.
In order to control the vast nation and its revolutionary reshaping during a chaotic time, Lenin and later Stalin, created a system of Commissars. These were not limited to military and instilling party loyalty, but were used throughout Soviet society. A commissar and his staff had absolute authority, answering only to the dictator and by-passing the various local councils and people's senates. Two things to note here:
1. their spheres were ambiguous and often over lapped responsibilities of other commissars. This in turn caused a large volume of infighting. Sure this is very wasteful of resources and confusing, but what it does do, is allow the dictator to keep ultimate power by keeping his most powerful minions at each others throats with the dictator as the ultimate arbitrator of power.