In the article, the author examines the restructuring of the external service of the besieged militia of Leningrad in the first months of the war, which was required in connection with the introduction of martial law and the establishment of the German-Finnish blockade. The restructuring of the militia was carried out both in the mode of service and in attracting police officers to the Red Army, with a significant expansion of law enforcement tasks and with the complication of social relations. In conclusion, it is stated that despite the difficult conditions of the blockade, the city police by the end of 1941 managed to basically rebuild in a military manner and in the following years to ensure the public safety of Leningrad.