The RSDLP was not the first Russian Marxist group; the Emancipation of Labour group had been formed in 1883. The RSDLP was created to oppose the revolutionary populism of the Narodniks, which was later represented by the Socialist Revolutionary Party (SRs). The RSLDP was formed at an underground conference in Minsk in March 1898. There were nine delegates: from the Jewish Labour Bund, and from the "Robochaya Gazeta" ("Workers' Newspaper") in Kiev, both formed a year earlier in 1897; and the League of Struggle for the Emancipation of the Working Class in Saint Petersburg. Some additional social democrats from Moscow and Yekaterinburg also attended. The RSDLP program was based strictly on the theories of Karl Marx and Friedrich Engels. Specifically, that despite Russia's agrarian nature at the time, the true revolutionary potential lay with the industrial working class. At this time, there were three million Russian industrial workers, just 3% of the population. The RSDLP was illegal for most of its existence. Within a month after the Congress, five of the nine delegates were arrested by the "Okhrana" (imperial secret police).