Strengths and weaknesses of square keep castles?

This passage says that the government is necessary because . the passage states that checks and balances are needed to

Religious men who lived apart from society

Which of these did the soviet union do in 1961? it built a wall through berlin to keep people from moving to the west. it used force to destroy a wall the united states had built in berlin. it convinced the british and french to merge their zones in berlin with the soviet zone. it threatened to bomb berlin if the united states did not leave within 30 days.