Loss of citizenship by persons of Ukrainian, Belarusian, Russian, Lithuanian, Latvian, Estonian and German nationalities.
Upon the entry into force on 19 January 1951 of the Polish Citizenship Act, there was a loss of Polish citizenship by persons who, while on 31 August 1939 had Polish citizenship, but on the day the Act enters into force, they live permanently abroad and are of Ukrainian nationality. , Belarusian, Russian, Lithuanian, Latvian, Estonian, German. The exception were people whose spouse had Polish citizenship and lived in Poland.
As one can assume, the legislator's goal was to deprive Polish citizenship of people of non-Polish nationality who, as a result of "winning" by Poland in World War II, found themselves in the USSR or Germany (East Germany and West Germany). By the way, however, the loss of Polish citizenship affected people who also lived on other continents (e.g. in South America) and who emigrated from Poland much earlier - before the outbreak of World War II.
The above rules seem clear, however, it is worth paying attention to one aspect. Well, the loss of citizenship did not always extend to the children of people losing citizenship. This could be the case when the wife of a Polish citizen losing Polish citizenship also had Polish citizenship and was of a different nationality than Ukrainian, Belarusian, Russian, Lithuanian, Latvian, Estonian or German (i.e. not necessarily Polish). Well, according to the Act of 1920 on citizenship of the Polish State (effective until January 18, 1951), Polish citizenship was acquired through marriage. This means that a woman of nationality, let's say Argentine or Brazilian, getting married to a Polish citizen, acquired Polish citizenship. Of course, this also concerned marriage with Polish citizens of Ukrainian, Belorussian, Russian, Lithuanian, Latvian, Estonian and German nationalities. When the act of 1951 entered into force, the husband of such a woman lost Polish citizenship, but she still remained a Polish citizen. According to art. 5 of the 1951 Act, a change in the citizenship of a spouse did not entail a change in the citizenship of the other spouse. Children born from this relationship after January 19, 1951 acquired Polish citizenship after their mother. However, children born before January 19, 1951 did not lose Polish citizenship, because only their father lost Polish citizenship on that date, not their mother.
