Answer:
Poland and Hungary
Step-by-step explanation:
The Iron Curtain was the physical boundary that divided Europe into two separate areas. From the end of World War II until 1991.
In 1956 the Hungarian Uprising was a nationwide revolution against the Hungarian People´s Republic and the Soviet-imposed policies. It was the first major threat to the Soviet Union since World War II.
In Poland, also in 1956, there were a series of protests against the communist government of the Polish People´s Republic. It began with workers demanding better working conditions and were met with violent repression.
I hope this answer helps you.