Crackow ghetto built. Jews forbidden to leave ghettos on pain of death. Gentiles who knowingly help Jews are subject to the death penalty. Lvov ghetto formed, the third largest in Poland. Most of the ghettos in Poland were established by the beginning of 1942.
Death camps begin operations.
300,00 people deported from the Warsaw ghetto to Treblinka death camp. Crackow ghetto liquidated. Attempt to liqudate Warsaw ghetto is met with unexpected armed resistance. The Warsaw ghetto is liquidated. The Lvov ghetto is liquidated.