A collection of formerly classified U.S. government documents providing a documentary record of the successes and failures of the U.S. intelligence community in its efforts to spy on the Soviet Union during the Cold War. This document collection covers the period from the end of World War II in 1945 until the collapse of the Soviet Union in 1991, but also includes a number of formerly classified historical reports and articles written by U.S. intelligence historians since the end of the Cold War.