You should rather say - Polish communist regime with the largest number of Jewish origin members... The Problem with Polish-Jewish realtions is not so clear as you claim to be. Many Poles hated Jewish neighbours but also many Jews were dificient with loyality to the country where they were living in.
Austria's far-right leader Strache blames U.S., NATO for migrant crisis (Reuters)
from the article: Polish walkway named for woman who saved Jews