[BugBrother]

As you know: In my references, most researchers seems to be between 15-20 millions.

My definition of slave:

Someone living with no rule of law. No human rights. E.g. their property and lives can be taken on a whim by their rulers. They are not allowed to leave, or there are violent repercussions.

A typical communist state. And slavery.

What is unique with those criteria?

[mlvljr]

Ok, so we are down from the sensational 60+ M figures to 3-4 times less now, that's progress (still questionable figures though) :)

A "typical" communist state from 50 years may not give its people what a pedantic contemporary person would call a full set of "human rights", but would provide free education, medicine, and so on (not to mention lesser level of violent crimes often), how's that slavery?

[as regarding not being able to leave -- you can make an attempt and force yourself to read above on that -- difference in income equalities, forming a nice "brain drain potential" is a pragmatic reason to constrain emigration, not some mysterious appetite of "party leader" for eating their own people alive]

You know absolutely nothing about communism, so to say :)