When the RSDLP split in 1903 between the
Bolsheviks, led by Lenin, and the
Mensheviks, Bonch-Bruyevich was among the original Bolsheviks. He helped bring out the RSDLP newspaper
Iskra while it was still under Lenin's control, and backed Lenin during 1904, when it appeared he might be losing control of the Bolsheviks to conciliators who wanted to heal the split. In December 1904, he helped organise
Vpered, the first Bolshevik newspaper. According to Lenin's widow "Bonch-Bruyeich was in charge of the business side. He permanently beamed, concocted divers grandiose plans, and was always dashing around on printing-press matters." He also helped set up and run the party archive. Bonch-Bruyevich returned to Russia early in 1905, and for a time worked illegally for the Bolsheviks in
St. Petersburg, organising an underground storage of weapons. After the
1905 revolution, he was able to operate legally. In 1906, he organised the Bolsheviks' weekly newspaper
Наша мысль (Nasha mysl - Our Beliefs or Our Idea), the journal
Вестник жизни (Vestnik zhizni – Herald of Life), and several other publications. From 1907, he headed the Bolshevik publishing house,
Жизнь и знание (Zhizn i znanie – Life and Knowledge). Bonch-Bruyevich was head of administration for the Council of People's Commissars (equivalent to head of Lenin's private office) from November 1917 to October 1920. Between December 1917 and March 1918 he was the chairman of the Committee against Pogroms and in February – March 1918 a member of the Committee for the Revolutionary Defense of Petrograd. From 1918 he was the deputy chairman of the Board of Medical Colleges. In 1919 he was the chairman of the Committee for Construction of Sanitary Checkpoints at Railway Stations in Moscow and the Special Committee for Rehabilitation of Water Supply and Sanitation in Moscow. Between 1918 and 1919 he was the head of the publishing house of the Central Committee of the Russian Communist Party (Bolsheviks) "
Kommunist." Bonch-Bruyevich took an active part in nationalization of the banks in preparation of the Soviet government moving to Moscow in March 1918. In 1918 as managing director of the Council of the People's Commissars, he endorsed setting in motion the
Red Terror. In 1918 he was elected a member of the
Socialist Academy of Social Sciences. After Lenin's death, he did research and authored works on history of the revolutionary movement in Russia, history of religion and atheism, sectarianism, ethnography and literature. In the Soviet Union, Bonch-Bruyevich was best known as the author of a canonical Soviet book about Vladimir Lenin, whom Bonch-Bruyevich served as secretary in the years immediately following the Bolshevik revolution in 1917. Following Lenin's death, Bonch-Bruevich was one of the key people involved in organising the funeral. He personally opposed the mummification of Lenin's body. == Later life and career ==