After the incorporation of Estonia into the Soviet Union on 6 August 1940, EKNÜ merged into the All-Union Leninist Young Communist League (VLKSM). The Estonian branch of VLKSM had the name 'Leninist Young Communist League of Estonia' (Eestimaa Leninlik Kommunistlik Noorsooühing, ELKNÜ).
Following Estonia's annexation by the Soviet Union on 6 August 1940, EKNÜ joined forces with the All-Union Leninist Young Communist League (VLKSM). The Estonian division of VLKSM was called 'Leninist Young Communist League of Estonia' (Eestimaa Leninlik Kommunistlik Noorsooühing, ELKNÜ).