 After the dissolution of the Union in 1991, the rest of the archives were opened to historians, resulting in much new information about Stalin coming to light, and producing a flood of new research.Leninists remain divided in their views on Stalin; some view him as Lenin's authentic successor, while others believe he betrayed Lenin's ideas by deviating from them.The socio-economic nature of Stalin's Soviet Union has also been much debated, varyingly being labelled a form of state socialism, state capitalism, bureaucratic collectivism, or a totally unique mode of production.