Long time lurker, first time poster. Hope I did it right.

So I was reading the wikipedia page called "The Holocaust in Poland" and it has this paragraph under the header "Antisemitism":

"Polish antisemitism had two formative motifs: claims of defilement of the Catholic faith; and Żydokomuna (Jew-communism). During the 1930s, Catholic journals in Poland paralleled western European social-Darwinist antisemitism and the Nazi press. However, church doctrine ruled out violence, which only became more common in the mid-1930s. Unlike German antisemitism, Polish political-ideological antisemites rejected the idea of genocide or pogroms of the Jews, advocating mass emigration instead.[a] Joseph Stalin's occupation of terror in eastern Poland in 1939 brought what Jan Gross calls "the institutionalization of resentment",[169] whereby the Soviets used privileges and punishments to accommodate and encourage ethnic and religious differences between Jews and Poles There was an upsurge in the anti-Semitic stereotype of Jews as Communist traitors; it erupted into mass murder when Nazi Germany invaded Soviet eastern Poland in the summer of 1941. A group of at least 40 Poles, with an unconfirmed level of German backing, murdered hundreds of Jews in the racially aggravated Jedwabne pogrom. There was a rash of other massacres of Jews across the same formerly Soviet-occupied region of Łomża and Białystok around the same time, with varying degrees of German death squad incitement or involvement: at Bielsk Podlaski (the village of Pilki), Choroszcz, Czyżew, Goniądz, Grajewo, Jasionówka, Kleszczele, Knyszyn, Kolno, Kuźnica, Narewka, Piątnica, Radziłów, Rajgród, Sokoły, Stawiski, Suchowola, Szczuczyn, Trzcianne, Tykocin, Wasilków, Wąsosz, and Wizna.[170]"

The text straight up blames Polish antisemitism and violence on Stalin and the Soviets. Obviously, this made me very suspicious. Does anyone know what it refers to, what the supposed evidence that the Soviets stoked antisemitic violence is, and have any alternative sources I can read?

Thanks!

EDIT: link https://en.wikipedia.org/wiki/The_Holocaust_in_Poland#Antisemitism