"A particular form of socialism grew up in the post-war period in the conditions of the Cold War [...] East Berlin was absolutely at the front line of the cold war. That’s what the Berlin Wall was. It was a front line between two social and military systems and two military alliances, and a very tense one at that. It wasn’t just some kind of arbitrary division to hold people in, it was also a front line in a global conflict. And that conditioned a lot of the things that happened."