As far as I am aware, there were - and still are - rifts between different Jews.
For example the Jewish community living in the areas which are nowadays located in central Poland, was historically (ie. by 18th century, perhaps mid-19th century) quite well integrated with the Polish majority. Of course, they observed their distinct religion and traditions, they had their place in the layered society - higher than the peasants, lower than the nobles - and there were occasional conflicts, but it was all familiar and clear to all the parties. The local Jews, if they spoke a non-Jewish language - it was typically Polish or German.
Then towards the end of 19th century the Russians decided to resettle the Jews from other parts of the empire to the western-most regions - which at the time was reaching as far as modern central Poland - what
@Awwal12 was kind to refer as "Jewish presence on other territories was non-existent for legal reasons". However those people were quite alien to the local cultures; if they spoke any non-Jewish language it was Russian rather than Polish (sometimes as the first language), they did not understand the Polish catholic or protestant culture and mentality, because their former neighbours were orthodox Russians, they were perceived by the Poles as yet another tool for rusification, etc. To make a long story short - they were indeed different kind of Jews, alien to the local "Polish" Jews, not even mentioning the Poles - and their arrival ignited a lot of conflicts.
The Soviet times added yet another complication, because the Jews were overrepresented in the Bolshevik party (as were some other minorities, in fact; and ethnic Russians were under-represented). The Soviet regime at the time resembled German nazi regime more than any modern country (apart for the systemic antysemitism), perhaps save North Korea. The Bolsheviks, being progressive international communists and atheists, aimed at the global labour revolution while perceiving traditional societies, based on religion or ethnicity, as backwards - including the Jews living in Poland, who were mostly traditional and religious. So the Polish and the Soviet Jews did not have many reasons to like or respect each other in any way - especially that
@marco_2 referred to Soviet officers of Jewish origin, rather than to the private persons.
It's damn complex and difficult to understand for modern people because we tend to apply our modern mental maps to the past times, and it simply does not work. Never the less, I hope that albeit it's a simplification, it sheds some light without starting a flame-war.
