Have there been any true "communist" nations as Marx envisioned? Most individuals refer to the former USSR as a "communist" nation, but, in reality, it was only a "socialist" nation with a high level of governmental control in all areas of its citizens' lives.
Have there been any true "communist" nations as Marx envisioned?
(I am not certain of whether I use established English terminology here).

The answer is no, because in a communist state (as described by Marx), there are no markets, especially, markets for production factors. And in none of the countries that implemented a socialistic socio-economic system, was labor "directly socialized" -it continued to be considered as owned by each worker individually, and it was priced, bought and sold. And it doesn't matter how this was done, i.e. of whether the wages were determined through some market mechanism or decreed by the state. All it matters is that labor was still private property.