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 Zadov Lev Zadov Lev Nikolaevich Zadov (Zinkovsky) () April 11, 1893 - September 25, 1938, Kiev was chief of military intelligence of the Revolutionary Insurrectionary Army of Ukraine, and later an OGPU operative. Born Lev Zadov, he changed his last name to Zinkovsky. Lev Zadov was born in the Russian Jewish agricultural colony Veselaya. About 1898-1900 his family fell on hard times and moved to Yuzovka, where his father found work as a coachman. Zadov graduated at a Jewish elementary school there and started to work as a manual laborer at a mill, later working at Yuzovka Metallurgical Works. Lev Zadov