In 1932 , the NKVD forced him to sign a statement promising never to reveal the truth of his parentage .
Konstantin was enrolled into Leningrad University , possibly with the discreet help of his father .
In 1932 , the NKVD forced Konstantin to sign a statement promising never to reveal the truth of Konstantin 's parentage .
Konstantin was enrolled into Leningrad University , possibly with the discreet help of his father .