Красногвардейский район
On August 1, 1927, the uyezds were abolished and Trotsky District, with the administrative center in the town of Trotsk, was established. The governorates were also abolished, and the district was a part of Leningrad Okrug of Leningrad Oblast. It included parts of former Trotsky Uyezd. On August 2, 1929, after Trotsky was deported from Soviet Union, Trotsk was renamed Krasnogvardeysk, and the district was renamed Krasnogvardeysky. On July 23, 1930, the okrugs were abolished as well, and the districts were directly subordinated to the oblast. In the 1930s, some areas from Oraniyenbaumsky and Luzhsky Districts were transferred to Krasnogvardeysky District. On October 3, 1938 Krasnogvardeysk was designated a town of oblast significance. Between September 1941 and January 1944 the area of Krasnogvardeysky District was occupied by German troops.