The nature of Polish jokes?

Why and in which country was it?

In Poland.

For "rozpowszechniania treści antysemickich i nawoływania do nienawiści na tle różnic narodowościowych". =Diffusing antisemitic texts and encouraging hatred on the basis of national differences

@jon357
I thought you could tell jokes about Jews in Poland.

You can tell jokes about anyone. It's when those jokes cross a line that problems start, at least under Polish law.