This was known as the "iron curtain." It was a term used to describe the boundary in Europe, which formed at the end of WWII and lasted until the ending of the Cold War.
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It looks like the item that you posted has missing information but I'd like to answer this statement. Civil disobedience is a non-violent, public refusal to obey allegedly unjust laws. Examples of civil disobedience are Salt March, Extramadura Campaign, Flying pickets and sit-ins, dismantling unwanted enterprises, and poll tax non-payment.
Chattel slavery was first used in the New World by the Dutch who entered the slave trade way before others and sold slaves even to founders of Jamestown.
