Why the Soviet Union did not build a nationwide computer  network (2008) [pdf]
In Romania you would get arrested if you had a walkie-talkie. The fixed phones were installed only in the homes of people that were part of the regime (even if you had a very simple role like handling money). They invested some on PCs but only until it became clear that they allowed easy access to information. Then it was dead.So in my view no communist country would invest in a national network because that would make information easier to transmit and this would undermine the regime. Keep people in the dark and they might be happy with their misserable life. Even people closer to the regime believed they had a good life because they received bananas and oranges before every Christmas...