Your “dictatorship of the working class” will never exist in practice unless you let the direction of the government be decided by a voting proletariat
…and good luck ever seeing fair elections in a one-party state
a dictatorship of the working class is not a dictatorship in a modern sense. it means the working class get to decide the flow of the economy, not a select few people like an oligarchy or fascism. nor is the society discriminatory as the workers united