June 20, 1648- Bogdan Khmelnytsky killed many Poles. The Jews were even more hated than the Poles and were massacred ruthlessly. During the next ten years, over 700 Jewish communities were destroyed and between 100 and 500,000 Jews lost their lives.
June 29 1946- Front page of the Palestine Post:
Army [British] seize Jewish Agency, hold leaders, 1,000 others in dawn swoop. The British mandatory government arrested 100 leaders.
The day became known as "Black Shabbat".