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 Berg second child and though Polina sued, the Russian Orthodox Church granted custody to her Christian husband. Berg's mother helped raise the children, Simon (born 1911) and Raissa (born 1913). Berg married Maria Mikhailovna Ivanova, the daughter of a ship's commander, in 1923. Berg was honored for a lifetime of scientific achievement by the Imperial Russian Geographical Society and presented with the P.P. Semenov-Tian-Shansky Gold Medal. The Berg Mountains in Antarctica, Cape Berg in Severnaya Zemlya and Cape Berg in Zemlya Georga were named after him. Lev Berg Lev Semyonovich Berg (also known as Leo S. Berg) (; 14 March 1876,