 In the 1930s, the Korenization was reversed and its proponents were repressed.During the Polonization of the Grand Duchy in the 16th and 17th centuries, a large number of Orthodox Ruthenians, led by Princes Mstislavsky, Belsky and Galitzine, escaped the repressions to Moscow.In documents of that time they are also called "Litvins" or "White Ruthenians".