In order to effectively execute such planning and transition from capitalist to communist, it required concentration of power in the federal government - further management was required to maintain equitable distribution of population, labor and resources.

That's why, in the transition period, power would end up concentrated in the hands of a small group of people.

Obviously eventually the idea was that the State would cease to be anything more than a mechanism for distribution of resources and stop managing people, but there are an awful lot of problems with that, conceptually.

Also, the guy I responded to said it didn't have to involve central planning. It kinda does, at least Marx and Engel's version does.