Please see the related question. Identification was not secret.
yellow starduring the holocaust Jews were forced towear a yellow star of david on their clothes.
The Jews who identified with and imitated the Greeks were called Hellenizers.
They were escaping the Holocaust, Palistine was a safe-haven really.
Mexico accepted very few Jewish refugees in the 1930s and 1940s.
High unemployment. (It was the 1930s).Antisemitism.
the only Jews that were removed in the 30s were those that were arrested.
The United States.
Jews were identified by membership in a synagogue. In Europe the government keeps a record of population by religion. That also identified Jews. Also, males were identified by checking to see if their penis had been circumcised. (Jews and Muslims circumcise their sons. Americans started circumcising when Jews had far fewer infections from trench warfare in The Civil War and World War 1. Europeans refused to learn from the Jews.)
From the spring of 1933 onwards.
Star of David
they were banned from practicing anything but most kept doing it secretly
The Yellow Star of David .