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 Tikhomirov competing world views: the dualistic and the monistic. The dualistic recognizes the existence of God and the world created by God. The monistic asserts that the world has always existed of its own self. Tikhomirov then traces through all of history as the continual struggle of these two views, which will culminate at the apocalyptic end. Following the Russian Revolution of 1917, Tikhomirov worked as a school secretary in Sergiev Posad. He died on October 10, 1923. Lev Tikhomirov Lev Alexandrovich Tikhomirov (; 1852, Gelendzhik – 1923, Sergiyev Posad), originally a Russian revolutionary and one of the members of the