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 Lev Davidovich Belkind Prof. Lev Davidovich Belkind (; (August 27, 1896, Myrhorod – November 16, 1969) was a Soviet scientist, engineer and historian; author of numerous publications on the history of science and technology. His academic activity is associated with the Moscow Power Engineering Institute (Technical University) (), where he has founded the department of Lighting Engineering () in the Physics-Energy Faculty () in 1932. In 1937, he became the first dean of the faculty of Electro-Physics upon its formation (). Later he has headed the department of History of Engineering () Fluent in Russian, English, French and German, and