Ukrainians in Russia include all the family of hetman Ivan Mazepa, A. Vojnarovsky, and those in Mazepa's Cossack forces that returned to Russia. Some were imprisoned in exile for the rest of their lives such as hetmanPavlo Polubotok, Pavlo Holovaty, P. Hloba and Petro Kalnyshevsky. Beginning in the 19th century, there was a continuous migration from Belarus, Ukraine and Northern Russia to settle the distant areas of the Russian Empire. The promise of free fertile land was an important factor for many peasants who until 1861, lived under Serfdom. In the colonization of the new lands, a significant contribution was made by ethnic
Christianity in Russia subscribers in Russia as early as 1887. In 1935, the Watch Tower Society unsuccessfully attempted to establish a branch office in the Soviet Union to support members already there. By 1939, thousands of Jehovah's Witnesses were residing in the Baltic states when the Soviet Union absorbed those formerly independent countries. In the 1940s, the Soviet government forcibly dispersed thousands of Witnesses, in a program named Operation North, later described by Dr. N. S. Gordienko, a professor at Herzen University as having "just the opposite of what was expected; they wanted to weaken the organization of Jehovah's Witnesses in the USSR,