To prevent East Germans from escaping to West Germany is the right answer.
The government of East Berlin in the year 1961 built the Berlin Wall. The main objective of building the Berlin Wall was to prevent the fleet of people from East Berlin to the West. In several ways, it was the ideal representation of the "Iron Curtain" that divided the democratic western nations and the communist nations of Eastern Europe during the Cold War.
Franklin Roosevelt was having problems with the United States Supreme Court during his second term in office because the Supreme Court kept finding his policies unconstitutional.
The answer would be: The Fugitive Slave Act. It states that anyone who sees a runaway slave must report it or they themselves can get punished. Hope this helps :)
