Abstract: The subject of this research is the system and types of normative legal acts that regulate the establishment and activity of the Central Committee on Prisoners of War and Refugees as a part  of the Council of People’s Commissars on War Affairs of the RSFSR prior to being assigned to People's Commissariat for Interior Affairs of the RSFSR in May 1919. The establishment of migration authorities took place in the objectively severe conditions of civil war and foreign intervention, which affected their legal status. The scientific novelty of this work consists in provision of classification of legal acts in accordance with the legal force, subjects of compliance, content area, and the nature of regulations contained therein. The conducted research demonstrates that the formation of grounds of legal regulation of the activity of the Central Committee on Prisoners of War and Refugees tool place simultaneously with the establishment and development of the Soviet law as a new historical type of law, and these grounds are its constitute elements. The obtained results significantly broaden our historical knowledge, allow rationalizing experience of the past and implementing it in the educational process along with the current practice aimed at improvement of organization and activity of migration authorities.