of party's activities during this time were Comrade Artyom (Fyodor Sergeev), Vladimir Bonch-Bruyevich, Miron Vladimirov, Kliment Voroshilov, Serafima Gopner, Sergey Gusev, Lidia Knipovich, Gleb Krzhizhanovsky, Grigory Petrovsky, Nikolay Skripnik, Alexander Schlichter, Yemelyan Yaroslavsky, and others. During the following year of government reaction in 1907–10 Bolshevik organizations in Ukraine have suffered significant losses, yet continued their revolutionary activities. Guided by decisions of the 1912 Prague Conference, those Bolsheviks carried out work to expand and strengthen ties with the masses, their international upbringing, preparing workers to new revolutionary battles, were exposing supporters of what was labeled as "liquidationism", "otzovizm" (recalling representatives from the State Duma), trotskyism and bourgeois nationalism. During the years of World War I (1914–18) the Bolsheviks of Ukraine propagated the Lenin's slogan of transforming the imperialist war into a civil war and fought against social chauvinism and revolutionary defeatism.