I suppose you are talking about government-sponsored propaganda that was created by the Soviet Union. The USSR was formed in 1922. During that time, many existing producers and filmmakers fled the country due to imposed censorship on the part of the new regime. Government funding only allowed for short films that perpetuated ideas that the Soviet regime wanted to impose on the people.

These films were a form of propaganda known as agitki. Agitki films were intended to both agitate and enthuse the public about the new Soviet regime. A handful of Russian films made prior to the Soviet regime were heavily censored and re-shown in cinema houses of the time, while others were destroyed or shelved. A very small percentage of Russian films made prior to this time remained in private hands.

A few agitki films produced by the Soviet regime as propaganda, as well as posters and other materials remain today, but it is unclear as to who maintains the rights to those.

Sources:

http://agitki.ru/

http://www.filmreference.com/encyclopedia/Romantic-Comedy-Yugoslavia/Russia-and-Soviet-Union-THE-CINEMA-OF-STALINISM-1930-1941.html

Depends where the masters to those films are. I imagine whoever has the masters has the creative rights to the film. There's no USSR to say otherwise.