Do you actually believe an "iron curtain" (a term invented by the West) kept everyone inside the USSR? You're really naive. The capitalists started two world wars, massacred six million Jews, and colonized whole continents resulting in the death of tens of millions of people, so keep deluding yourself thinking capitalism is less violent. Some of the most brutal authoritarian regimes are run by capitalists, like Saudi Arabia and Afghanistan.
Do you actually believe an "iron curtain" (a term invented by the West) kept everyone inside the USSR?
Were Eastern Europeans free to travel?