The yellow star, the scarlet letter, and ‘International Megan’s Law’https://www.washingtonpost.com/news/volokh-conspiracy/wp/2016/01/06/the-yellow-star-the-scarlet-letter-and-international-megans-law/
When I was a Soviet citizen, and after 1991 citizen of Belarus, there was a line in my passport which identified me as a Jew.
This looked like: 5. Nationality: Jew.
Even all russian jews was not religious, because soviet state destroyed all Jewish religious institutions, closed jewish schools, destroyed all books on their language. The only thing they kept was Jew in passport, just like nazi Germany J.
Nazi Germany was not the only country known to add such a moniker to the passports of its citizens. There were USSR and Belarus. As you understand identifying somebody as a Jew was very harmful for that person, discrimination at any situation like getting job, education and so on. Even beating by angry idiots hating you just for being a Jew.
I remember my grandfather story from ww2. He had document identify him as a Jew, and he took passport of dead person without such identity. This way he was not killed by Germans nazi. All people with jew in their documents were killed by nazi who also were christians.