The Bolshevik Centre was a select group of Bolshevik

Bolshevik

The Bolsheviks, originally also Bolshevists , derived from bol'shinstvo, "majority") were a faction of the Marxist Russian Social Democratic Labour Party which split apart from the Menshevik faction at the Second Party Congress in 1903....

s that led the organization in secret. The Centre conducted its activities in secret in part so as to avoid the prohibition by the Russian Social Democratic Labour Party

Russian Social Democratic Labour Party

The Russian Social Democratic Labour Party , also known as Russian Social Democratic Workers' Party or Russian Social Democratic Party, was a revolutionary socialist Russian political party formed in 1898 in Minsk to unite the various revolutionary organizations into one party...

 ("RSDLP") on separate committees outside of the RSDLP.

The Bolshevik Centre was headed by a "Finance Group" consisting of Vladmir Lenin, Leonid Krasin

Leonid Krasin

Leonid Borisovich Krasin July 1870, Kurgan – November 24, 1926) was a Russian and Soviet Bolshevik politician and diplomat.-Early years:Krasin was born in Kurgan, near Tobol'sk in Siberia. His father, Boris Ivanovich Krasin was the local chief of police...

 and Alexander Bogdanov

Alexander Bogdanov

Alexander Aleksandrovich Bogdanov –7 April 1928, Moscow) was a Russian physician, philosopher, science fiction writer, and revolutionary of Belarusian ethnicity....

.