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 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