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… - Seumas Milne

Communism, which came to control a third of the planet in a generation, was the most important political movement of the past century. It carried out what other socialists had only talked about, abolishing capitalism and creating publicly owned, planned economies. Its crimes and failures are now so well rehearsed that they are in danger of obliterating any understanding of its achievements - both of which have lessons for the future of progressive politics and the search for a social alternative to globalised capitalism.

It is this record of unabashed national egotism and arrogance that drives anti-Americanism among swaths of the world's population, for whom there is little democracy in the current distribution of global wealth and power. If it turns out that Tuesday's attacks were the work of Osama bin Laden's supporters, the sense that the Americans are once again reaping a dragons' teeth harvest they themselves sowed will be overwhelming.

But any glimmer of recognition of why people might have been driven to carry out such atrocities, sacrificing their own lives in the process - or why the United States is hated with such bitterness, not only in Arab and Muslim countries, but across the developing world - seems almost entirely absent.