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A very interesting account also comes from Bertrand Russell who visited RSFSR in 1920 and then published a book that was very pessimistic on where it's all heading:
www.gutenberg.org/ebooks/17350
Surely, the plan was for the dictatorship to be temporary but since the criteria for its existence were vague, the very same quotes from Marx and Engels were used by Stalin some 20 years later.
