In the winter of 1909, a political bombshell exploded in tsarist Russia. Scandal swept not only the empire but the entire world with the exposure of the secret life of one man. Newspaper headlines introduced him as a "twentieth-century Judas," and since his initiation to the most notorious villains' club, his name, Evno Filipovich Azef, has remained in the Russian tradition as a synonym for scandalous duplicity, unscrupulous perfidy, and criminal provocation. His story is inseparable from the history of the Russian Socialist-Revolutionary party (PSR) and the terrorism that plagued the tsarist regime in the first decade of the twentieth century. More than 17,000 people were killed or wounded throughout the empire between 1905 and 1910 as a result of political assassination attempts alone. The use of undercover police spies to infiltrate oppositionist groups was a primary means of combatting terrorist activity. Enter Evno Azef, a man who, before being reviled by Socialist-Revolutionary party leaders as a traitorous double agent, would spend fifteen years inside the PSR, the largest terrorist organization in Russia. A man who would rise to a position of prominence in the party's Central Committee, and become one of the most trusted leaders of its famous terrorist arm, the SR Combat Organization: Evno Azef, Russian master spy. A thorough investigation based on all available documentary resources-available for the first time due to the Soviet government's demise-Entangled in Terror: The Azef Affair and the Russian Revolution sorts out the facts of the case from rumors and legends. Entangled in Terror explores the background and history of the radical SR party and its Combat Organization, the course of Azef's career, his role within the party, and the extent and frequency of his contacts with the secret police. The book evaluates the consequences of the Azef affair for the party, for the Russian revolutionary movement, and for terrorism in Russia. Finally, Entangled in Terror examines