Hello,
I think, this is just a typo and you should read "alien" instead of "ailien". You should not translate this word, because this is the English word "alien" which cannot be used in Latvian text.
Some background:
In the pre-war Republic of Latvia everyone had a citizenship, and when independence was restored in 1991, "old" citizens and there descendants were granted citizenship. However, those who moved here from Russia, remained without a citizenship.
So, about 15% of inhabitants are so called "non-citizens". In 1990-ties, they had passports of former USSR with some stamps. Currently, they have documents called "Alien's passport".
As far as I understand, you are mentioning Soviet passports with stamps. Unfortunately, I don't know what exactly was written on these stamps.
Is that still important?