Iran's Revolutionary Guards are one of the most important forces in the Middle East today, but remain poorly understood to outside observers. In Vanguard of the Imam, Afshon Ostovar has written the first comprehensive history of the organization. Situating the rise of the Guards in the contexts of Shiite Islam, Iranian history, and international affairs, Ostovar takes a multifaceted approach in demystifying the organization and detailing its evolution since 1979. The book documents the Guards transformation into a power-player and explores why the group matters now more than ever to regional and global affairs. It is simultaneously a history of modern Iran, and an engrossing entryway into the complex world of war, politics, and identity in the Middle East.