Unindustrialized? Sure. Starving? You could add up the death counts of all known famines in Russia's pre-Bolshevik history and you end up with no more than half the amount dead in just the famine referenced in OP. And that's largely due to the policies implemented by Lenin[1] to ensure that food went primarily to supporters of the Bolsheviks.
How about the famine of 1932-1933[2][3] in which ~10 million (the number is disputed, but when it varies by millions, the point is made) died due to dekulakization[4], in which those farmers that had proved to be competent enough to gather some wealth after having been liberated by the Tsars a half-century earlier were brutally raped and murdered. Guess what happens when you kill all the competent farmers?
You've said that it was a "step forward at least up until the mid 1950's", meaning during Lenin and Stalin's reign? Do some damned reading[5] before you make claims like this.