Special settlements in the Soviet Union were the result of population transfers and were performed in a series of operations organized according to social class or nationality of the deported. Resettling of "enemy classes" such as prosperous peasants and entire populations by ethnicity was a method of political repression in the Soviet Union, although separate from the Gulag system of penal labor. Involuntary settlement played a role in the colonization of virgin lands of the Soviet Union. This role was specifically mentioned in the first Soviet decrees about involuntary labor camps. Compared to the Gulag labor camps, the involuntary settlements had the appearance of "normal" settlements: people lived in families, and there was slightly more freedom of movement; however, that was permitted only within a small specified area. All settlers were overseen by the NKVD; once a month a person had to register at a local law enforcement office at a selsoviet in rural areas or at a militsiya department in urban settlements.