At the beginning of XVI century over 50% of the global Jewish population lived in Poland, and in the middle of the century - over 80% of it.
As far as I remember (I have read it somewhere - but I don't remember where exactly) the word for "Poland" in Yiddish is very similar to the word for "paradise" - or something like that - in the same language - Yiddish.
Anti-semitism in Poland after the WW2 was directly connected with the popular - among Polish people - theory, that Jews = communists and that Jews are responsible for the fall of Poland in 1939 - especcialy the Soviet invasion of Poland.
Anti-semitism in Poland was not about hating Jews for being Jews, but about hating Jews for allegedly being communists.
Indeed - some percent of the Polish Jews were extreme communists
Such Jewish communist extremists, started their activity before the war - and during the Polish Campaign of 1939 commited some awful crimes:
http://forum.axishistory.com/viewtop...4820&p=1257170
Video in the thread above (from axis history forums) seems not to work - so I put it also here that everybody can watch after reading the thread above: