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
Alexander Bronstein Alexander Bronstein Alexander Bronstein (; born June 15, 1954 in Leningrad, USSR) is an entrepreneur and billionaire currently living in Tallinn, Estonia. He is an Estonian citizen. Bronstein is well known in Jewish circles and is vice president of the Eurasian Jewish congress. A keen philanthropist, he sponsored the building of the first synagogue and community centre in Estonia. Son of academic and World War II veteran (Mikhail Bronstein). Alexander Bronstein was born in 1954 in Leningrad. Anti-semitism drove the family to Tallinn, Estonia in 1956. In 1976 Bronstein graduated from Tartu State University with a degree in Applied Mathematics,