The 2nd Congress of the Russian Social Democratic Labour Party was held during July 30–August 23 (July 17–August 10, O.S.) 1903, starting in Brussels, Belgium (until August 6) and ending in London. Probably as a result of diplomatic pressure from the Russian Embassy, Belgian police had forced the delegates to leave the country. The congress finalized the creation of the Marxist party in Russia proclaimed at the 1st Congress of the RSDLP.
The Organising Committee for convening the Second Congress of the RSDLP was originally elected at the Białystok Conference held in March (April) 1902, but soon after the conference all the committee members but one were arrested. At Lenin's suggestion, a new Organising Committee was set up at a conference of Social-Democratic committees held in November 1902 in Pskov. On this committee the Iskra-ists had an overwhelming majority.
Under Lenin's guidance, the Organising Committee carried out extensive preparatory work for the Second Congress. Draft Regulations for the convening of the Congress were adopted at a plenary session held in Orel in February 1903. Following this plenary session, members of the Organising Committee twice visited the local Party organisations with a view to assisting them in their work. With their participation, the local committees discussed the draft Regulations, after which the Organising Committee finally endorsed the Regulations and approved a list of the local organisations entitled under them to representation at the Congress. The Organising Committee prepared for the Congress a detailed written report on its activities.
There were 37 sessions and 51 delegates. Of these, 33 supported Iskra, the party newspaper, 5 backed the Bund and there were 2 economists (Marxists who believed workers should concentrate on economic demands rather than political ones). 6 delegates were neutral. The fourth session asked whether the party should support a Dictatorship of the proletariat, all but one of the delegates voted for this, the economist Akimov abstained.