Lev Kamenev arrested in 1902, ending his formal education. From that point on, he worked as a professional revolutionary, and was active in the capital St. Petersburg, Moscow and Tiflis. He adopted the surname Kamenev during this period. In the early 1900s, he married Olga Bronstein, a fellow Marxist (and younger sister of Leon Trotsky, who had also adopted a different surname). The couple had two sons together. Kamenev joined the Communists in 1901. He took a brief trip abroad in 1902, meeting Russian social democratic leaders living in exile, including Vladimir Lenin, whose adherent and close associate he became. He also
Lev Davidovich Belkind knowledgeable in additional languages, Prof. Belkind was a prominent researcher and collector of materials on the history of science and technology, both Russian and International. He was considered an authority in the field of scientific history, being an author of unique biographical research work of a number of influential figures in the Russian science. In recognition of his scientific achievements and contribution he was awarded the "Honored Scientist and Technologist" title (). by the Soviet Academy of Sciences. Lev Davidovich Belkind Prof. Lev Davidovich Belkind (; (August 27, 1896, Myrhorod – November 16, 1969) was a Soviet scientist, engineer and