I. A. Baudouin de Courtenay was one of the first scholars to point to the social differentiation of Russian at the beginning of the 20th century. It laid the foundation for the sociolinguistic trend in Russian linguistics which began to actively develop in Russia after 1917. Scholars studied the influence of social factors on the language of new newspapers, which were published for the poorest and illiterate population of Soviet Russia. Sociolinguistic research for political reasons ceased in the 30s and resumed in Russia only in the 70s of the 20th century. By the end of the 20th century, the ideas of Baudouin de Courtenay were put to good use not only in linguistics but also in linguodidactics.