You're not engaging in this conversation with any civility or goodwill, so the only reason I invest any time at all responding to you is for the sake of others that might get misled by your poorly reasoned, disingenuous arguments.
There was no "iron curtain" in Soviet Russia, until after the devastation of WW2 when Soviet Russia incorporated East Germany and Berlin, which was within East Germany and yet full of NATO troops. The USSR had to rebuild after losing practically all of the immense amount of infrastructure that it built in Western Russia, between 1920 and 1940. Soviet Russia was invaded by 4 million Nazi Germans and 9 million red army soldiers died fighting them. About 18 million Soviet citizens perished, which amounted to a loss of 15% of the nation's population.
Imagine today if the United States were to get invaded by a foreign power and lose 15% of its population and most of its national infrastructure. The US would lose 49,500,000 people (49.5 Million). The US is surrounded by two vast oceans and was pretty much secure from being invaded in the same way the USSR was. It lost about half a million people in WW2. Yes losing half a million people was devastating for the US, as it would be for any country, but nonetheless, the Soviets lost thirty times that amount.
The Soviet Union had to rebuild itself and it was now facing a war with the West, because the American big-money capitalist ruling class began its "red scare" campaign against socialists and communists in the United States to demonize everything related to the Soviet Union, and hopefully repeal or at least blunt the "new deal" of the 1930s. The USSR assisted American leftists during the labor union struggles of the 1920s and 30s, and was seen by the American aristocracy as a threat to their power and wealth. The biggest fear of the American wealthy class was for the American working-class to adopt socialism and strip them of their power.
The Soviet Union had gained an immense amount of territory after WW2, splitting the spoils of war with the West after the defeat of nazi Germany. Germany was split between West and East and Berlin was right smack in the center of Eastern Germany. It was full of NATO troops from the US and Western Europe, so of course, a wall was built around it.
Furthermore, millions of Soviet citizens now had to rebuild their country and unfortunately, a significant % of them were shell-shocked and didn't want to continue with the communist experiment. It wasn't easy to establish a new order and civilization, after fighting a war and losing almost thirty million people, and most of your nation's infrastructure. The USSR was a new nation. You completely ignore that.
About 20% of the Soviet intelligentsia, academics, scientists, and engineers, sought to settle in Western Europe and the United States. So until the death of Stalin in 1953, there were some serious restrictions on travel for Soviet citizens. Yes indeed, that was the situation. Does that imply that communism doesn't work? No, whoever jumps to that conclusion is suffering from poor reasoning. NATO was created in 1947, right after the war and there wasn't a Soviet Warsaw Pact military alliance until the mid-1950s. The cold war started shortly after WW2 and for several years the USSR didn't have nukes. So of course, under those difficult circumstances, a developing nation might very well become a bit "paranoid" and more authoritarian, in an effort to survive and rebuild. Yep?
The Soviets rebuilt their country and by the late 1950s, it was a world superpower, rivaling the US which had over a century of industrial development ahead of Soviet Russia, and didn't suffer the same catastrophic devastation that the Soviets had during WW2. Communism turned Russia into a superpower in less than 15 years after the destruction of much of its national infrastructure during the war. The United States spent billions rebuilding Western Europe and Japan, whereas the USSR had to fend for itself. There was no help for the communists after WW2, they had to pick themselves up by their bootstraps and rebuild.
Keep believing whatever you want, but communism is in your future or in that of your progeny, so you should become a communist now. In the end, communism will become a necessity and self-evidently the only solution to advanced technology replacing wage labor. Deal with it. Seethe their and boil in your bitterness.