Valerian Andreyevich Osinsky

He moved to St Petersburg to make contact with members of Zemlya i Volya, and became one of that organisation's leading agents in the south.

Believing he knew the identity of the worker who had betrayed them to the police, Osinsky arranged for the suspected spy to be killed, in February 1878, by two revolutionaries named Ivan Ivichevich and Rostislav Steblin-Kamensky.

After the killing, posters were put up across Rostov, purporting to have been produced by the 'Executive Committee of the Socialist Revolutionary Party" warning: "Such is the fate that awaits every Judas.

[4] Later in 1878, Osinsky and Mikhail Frolenko successfully carried out a plan to rescue three revolutionaries, Leo Deutsch, Yakov Stefanovich and Ivan Bokhanovsky from Kiev jail.

[5] In May 1878, an official of the Kyiv police named Baron Geyking was assassinated by Grigori Popko, another member of the 'Socialist Revolutionary Party'.