Olga Kameneva Olga Kameneva Olga Davidovna Kameneva (, ; 1883 – 11 September 1941) (née Bronstein — Бронштейн) was a Russian Bolshevik revolutionary and a Soviet politician. She was the sister of Leon Trotsky and the first wife of Lev Kamenev. Olga Bronstein was born in Yanovka, Kherson Governorate, Russian Empire (present-day Kirovohrad Oblast, Ukraine), a small village 15 miles from the nearest post office. She was one of two daughters of a wealthy but illiterate farmer, David Leontyevich Bronstein (or Bronshtein, 1847–1922), a Jewish colonist, and Anna Lvovna (née Zhivotovskaya) (1850–1910). Although the family was of Jewish extraction, they were not
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