As World War II ended, dancing broke out in the streets of victorious capitals. But in Washington and Moscow, menacing ultimatums soon replaced declarations of common purpose. The music stopped, the Grand Alliance crumbled, and the Soviet Union and the United States squared off against one another. The victor in this war would be determined by the outcome of a series of geo-strategic battles. Which side would capture the Persian Gulfs oilfield's, and who would seize the Congolese uranium essential for the manufacture of atomic bombs? And whose air and naval bases would dominate the globe's vital traffic lanes from the Black Sea Straits to the Pacific Islands? Three British diplomats, Donald Maclean, Kim Philby, and Guy Burgess, did everything in their power to see to it that the Soviet Union prevailed in these clashes. The Cambridge Spies is the first book to detail their behind-the-scenes effort to sabotage America's national security apparatus during the crucial period between 1945 and 1951 when each, at various times, served at the British embassy in Washington. The book is the result of many years of digging through the State Department and Foreign Office records overlooked by previous scholars and undiscovered by government officials responsible for "purging" such files. For the first time in history the reader can follow the Soviet spies as they work behind enemy lines to sabotage the machinery of Western foreign policy. It is also the first book written by an American on these fabled British spies, and the first to chronicle their most effective period as allied diplomats and enemy agents. The Cambridge Spies reveals the story Washington managed to cover up for forty years. Telling it at a time the work is beginning to relive the fiftieth anniversary of many of the events described in these pages will only add to its explosive impact, and spark new historical debates on issues of abiding interest and contemporary concern.