Which of these countries would have been "behind the iron curtain" during the cold war?

All countries of the Warsaw pact, Czechoslovakia, Poland, Hungry, Bulgaria, East Germany, Romania, Albania and Yugoslavia at times. Also included would be other communist states, Mongolia, China, North Korea, and North Vietnam. communist-held Soviet bloc countries

Think of the countries that were east of East Germany. Examples would be Poland, Hungary, Yugoslavia, Czechoslovakia, etc.