(D) Immigrant membership in totalitarian party
(i) In general
Any immigrant who is or has been a member of or affiliated with the Communist or any other totalitarian party (or subdivision or affiliate thereof), domestic or foreign, is inadmissible.
(ii) Exception for involuntary membership
Clause (i) shall not apply to an alien because of membership or affiliation if the alien establishes to the satisfaction of the consular officer when applying for a visa (or to the satisfaction of the Attorney General when applying for admission) that the membership or affiliation is or was involuntary, or is or was solely when under 16 years of age, by operation of law, or for purposes of obtaining employment, food rations, or other essentials of living and whether necessary for such purposes.
(iii) Exception for past membership
Clause (i) shall not apply to an alien because of membership or affiliation if the alien establishes to the satisfaction of the consular officer when applying for a visa (or to the satisfaction of the Attorney General when applying for admission) that-
(I) the membership or affiliation terminated at least-
(a) 2 years before the date of such application, or
(b) 5 years before the date of such application, in the case of an alien whose membership or affiliation was with the party controlling the government of a foreign state that is a totalitarian dictatorship as of such date, and
(II) the alien is not a threat to the security of the United States.
https://uscode.house.gov/view.xhtml?req=granuleid:USC-prelim-title8-section1182&num=0&edition=prelim
