Chapter One. Introduction. The Study of Soviet Leadership.- Chapter Two. Oligarchy with a Predominant Leader, 1917-22.- Chapter Three. Rule by Pure Oligarchy, 1923-29.- Chapter Four. From the Predominant to the Dominant Leader, 1930-53.- Chapter Five. The Limits of the Predominant Leader, 1953-64.- Chapter Six. Predominant Leader within the Collective, 1964-82.- Chapter Seven. Collectivism Collapses, 1982-91.- Conclusion.