Intelligence was a major part of the Cold War, waged by both sides with an almost warlike intensity. Yet the question 'What difference did it all make?' remains unanswered. Did it help to contain the Cold War, or fuel it and keep it going? Did it make it hotter or colder? Did these large intelligence bureaucracies tell truth to power, or give their governments what they expected to hear? These questions have not previously been addressed systematically, and seven writers tackle them here on Cold War aspects that include intelligence as warning, threat assessment, assessing military balances,...