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
Semyon Davidovich Kirlian Semyon Davidovich Kirlian Semyon Davidovich Kirlian (; ; ; 20 February 1898 – 4 April 1978) was a Soviet inventor and researcher of Armenian descent, who along with his wife Valentina Khrisanovna Kirlian (; died 1972), a teacher and journalist, discovered and developed Kirlian photography. Kirlian was born in 1898 Yekaterinodar, Russian Empire (now Krasnodar, Russia) in an Armenian family. He possessed an early interest in, and aptitude for, work with electricity. Just before the Russian Revolution of 1917, Kirlian attended a conference in his home city at which Nikola Tesla gave talks and demonstrations; Tesla was one of Kirlian's