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 Pisarzhevsky Lev Pisarzhevsky Lev Vladimirovich Pisarzhevsky (also transliterated as Pisarzhevskii: ; 13 February 1874 – 23 March 1938) was a Ukrainian Soviet chemist who studied peroxides, peracids, and solutions. His contribution to the theory of catalysis is best known for his attempt to relate the catalytic properties of solids to their electronic properties. Lev Vladimirovich Pisarzhevsky was born on 13 February 1874 Kishinev in the Bessarabia Governorate of the Russian Empire (now Chişinău, Republic of Moldova). His mother relocated the family to Odessa following his father's death, where Lev Pisarzhevsky worked to support the family and studied at a school of