Well, they claimed that perfect society should not contain exploiter class at all. All people should be "the proletariat, the peasantry and the working intelligentsia" (which form one class) and there are no place to parasite classes in our society. In the time of Lenin-Stalin they say that if there are some parasite people, they should be caught and reforged into "the proletariat etc..." in special camps or killed if they don't want to be reforged. Later it was said that reforging is mainly succeeded and now very few remaining parasites will be reforged by themselves as a natural historical process.
So it was positioned as a dictatorship of everybody, not of some class or separate persons. The same propaganda as of democracy TM but in other words.