They had to keep their Jewishness to themselves, and not go into the outside world too often.
The answer to this question entirely depends on the time and place where a Jew lived. A Jew today in the United States or a Jew in 1100 in Toledo, Spain did not have to worry about being killed on account of their Judaism and as such were quite open about it. In Nazi Germany or the Soviet Union, this was obviously not the case. In the case of Nazi Germany, Jews had to actively escape the country or find a way to get to the labor camps where they could push off their ultimate death. In the Soviet Union, they had to continually pretend to be atheists.
In the Holocaust Jews were killed simply for being Jews, in fact simply for existing.
They were being systematically killed by the Nazis.
they feared being killed or beaten by the Nazis
Because it was the time of the holocaust and they were Jews. Since Jews were being killed, they had to go into hiding.
Jews have been killed throughout the centuries.
Exist and self-identify. Their 'capital crime' was being what they were, not doing anything that they did.
if you take dinosaur skin , and rub it on your face you can avoid protozoa.
the natzi's killed the Jews in the hollicost.
No one. Referring to the tags on this question, the Jews were the ones being killed in the Holocaust, along with several other groups of people.
Using it's wings to flee the conflict.
Hitler killed his wife and himself to avoid being captured by the Americans.
He offers no physical resistance to the band of egwugwu.