First problem is that the source is not objective and, predictably,
I thought you would like it. :)
does not mention the reasons why the Poles and the Polish government did what the article claims.
Ok, Ok, I wasn`t sure you were really interested.
en.wikipedia.org/wiki/1968_Polish_political_crisis
The anti-Jewish campaign had already begun in 1967 after the Soviet withdrawal of all diplomatic relations with Israel after the Six-Day War, but also involved a power struggle within the Polish communist party itself. The subsequent purges within the ruling party, led by Mieczysław Moczar and his faction, failed to topple Gomułka's government, but resulted in an exile from Poland of thousands of Jewswith the Jews who came to Poland right behind the Soviet tanks
Many were Polish-born Jews who felt Polish.