Der Spiegel has a fascinating article about a piece of historical documentation which has been uncovered, revealing whether it was Walter Ulbricht or Nikita Khrushchev who came up with the idea of building the Berlin Wall.

Khrushchev, at any rate, stepped up the pace. “We will give you one or two weeks to make the necessary economic preparations,” he told Ulbricht. “Then you will convene the parliament and issue the following communiqué: ‘Beginning tomorrow, checkpoints will be erected and transit will be prohibited. Anyone who wishes to cross the border can do so only with the permission of certain authorities of the German Democratic Republic.”

Khrushchev wanted to convince the East German population that the wall being built would protect them from Western spies, and he said that the Germans would understand.