According to Soviet law, 3,778,000 out of an eligible adult voting population of 113,050,000 were disenfranchised for various reasons.

References

The Distinctiveness of Soviet Law. Ferdinand Joseph Maria Feldbrugge, ed. Martinus Nijhoff Publishers: Dordrecht (1987): 110.

v t e Elections and referendums in the Soviet Union
Presidential elections	1990
Legislative elections	1922 1924 1925 1927 1929 1931 1935 1936 1937 1946 1950 1954 1958 1962 1966 1970 1974 1979 1984 1989
Regional elections	1938 1939 1947 1951 1955 1959 1963 1967 1971 1975 1980 1985 1990
Local elections	1922 1923 1924 1925 1926 1927
Referendums	1991