> It wasn't, but it started with that idea
It didn't start with that idea: Marx wrote of a "dictatorship of proletariat"; he explained that with this expression he was referring to the moment of the revolution, and i don't know if in other texts or speeches he argued that the revolution should be followed by a period of “dictatorship of the proletariat” - i ask this to a friend who knows much more of Marx's thought than me, muffa (npub1hk4…jqvm)
At the very least, however, the expression “dictatorship” was ambiguous enough to make the majority of “communists” fight for it, which then became the dictatorship of the former revolutionaries (mainly from the middle class) and the bureaucrats (mainly from the petty bourgeoisie).