The correct answer is Slavic peoples, Turkic Muslims, Non-Slavic Europeans, and German migrants. The Slavic people were all people like Russians, Ukrainians, Belarus people, and similar things. Turkic Muslims were in the form of Chechens or other types of minorities. Non-Slavic Europeans came in the form of Finnish people since Finland was a part of the Russian Empire. German migrants were mostly people who came from countries such as Prussia or other German parts of Europe.