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).
After Estonia's union with the Soviet Union on 6 August 1940, EKNÜ merged into the All-Union Leninist Young Communist League (VLKSM). The Estonian branch of VLKSM was designated as 'Leninist Young Communist League of Estonia' (Eestimaa Leninlik Kommunistlik Noorsooühing, ELKNÜ).