Yevno Fishelevich Azef was a Russian socialist revolutionary who also operated as a double agent and agent provocateur. He worked as both an organiser of assassinations for the Socialist Revolutionary Party and a police spy for the Okhrana, the Russian Empire's secret police. He rose through the ranks to become the leader of the Socialist Revolutionary Party's terrorist branch, the SR Combat Organization, from 1904 to 1908.
Yevno Azef
Socialist Revolutionary Party
The Socialist Revolutionary Party, was a major political party in late Imperial Russia, during both phases of the Russian Revolution, and in early Soviet Russia.
Kampf un kempfer, a Yiddish pamphlet published by the SRs exile branch in London, 1904
1917 SRs election poster whose caption in red reads партія соц.-рев. (in pre-1918 Russian), short for Party of the Socialist-Revolutionaries; the banner bears the party's motto Russian: Въ борьбѣ обрѣтешь ты право свое ("Through struggle you will attain your rights"); and the globe bears the slogan земля и воля ("land and freedom"), expressing the agrarian socialist ideology of the party.