The history of the Communist Party of the Soviet Union is generally conceived as also covering that of the Bolshevik faction of the Russian Social Democratic Labour Party from which it evolved. The date 1912 is often identified as the time of the formation of the Communist Party of the Soviet Union as a distinct party, and its history since then can roughly be divided into the following periods:
The Party, with its lineal predecessors and soi-disant heirs, used various names in succession:
In January 1912 the Bolshevik faction of the Russian Social Democratic Labor Party convened a 6th All-Russian Party Conference in Prague in the absence of their Menshevik adversaries. Over twenty Party organizations were represented. In the eyes of the Bolsheviks the conference had, therefore, the significance of a regular Party congress.
In the statement of the conference which announced that the shattered central apparatus of the Party had been restored and a new Central Committee set up is the following statement: "Not only have the banner of the Russian Social-Democratic Party, its program and its revolutionary traditions survived, but so has its organization, which persecution may have undermined and weakened, but could never utterly destroy." Moreover, the conference declared the Mensheviks expelled from the party. Thus the RSDLP effectively split, with the Bolsheviks and Mensheviks constituting separate political parties (Both groups would continue to use the name "RSDLP". The Bolshevik party added "bolshevik" to their name to differentiate themselves from the Mensheviks.)
In its resolution on the reports presented by the local organizations, the conference noted that "energetic work is being conducted everywhere among the Social-Democratic workers with the object of strengthening the local illegal Social-Democratic organizations and groups". The conference noted that the most important rule of Bolshevik tactics in periods of retreat - to combine illegal work with legal work within the various legally existing workers’ societies and unions - was being observed in all the localities.
The Prague Conference elected a Bolshevik Central Committee of the Party, consisting of:
and others. Stalin and Sverdlov won election to the Central Committee despite their non-attendance at the conference, as they were in exile at the time. The elected alternate members of the Central Committee included Mikhail Kalinin.