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 Kekushev survived and wrote a book of memoirs, "Zveriada"; however, it does not reveal much about his father's last years. Lev Kekushev Lev Nikolayevich Kekushev () was a Russian architect, notable for his Art Nouveau buildings in Moscow, built in the 1890s and early 1900s in the original, Franco-Belgian variety of this style. Kekushev's buildings are notable for his skillful use of metal ornaments and his signature with a lion ("Lev") ornament or sculpture. Kekushev was born in the family of a Russian officer in Vilnius (Maria Naschokina, p. 253; Simbirsk according to other sources). Kekushev graduated high school in Vilnius,