Oh I love the claim of "several dozen". Most of them numbered into the hundreds, often into the thousands. Odessa had so many that one has to identify them by year, just saying "Odessa Pogrom" is nowhere near enough. 1821, about 120. 1859, around 80. 1871, around 100. 1881, around 250. 1905, over 500. And those were only pogrom's in a single community, the ones that ravaged the countryside had much higher death tolls.
Hell, even into the 1980s they were still being prosecuted, which is why so damned many fled the Soviets to come to the West.
Hell, want a real life account, read "The Endless Steppe" by Esther Hautzig. She was 10 when the Soviets invaded Poland, and her family and many of the Jews of Vilna were rounded up and deported to Siberia. Sent there on cattle cars, they were placed un a work camp and forced to mine gypsum near Rubtaovak. Then part way through the war all the men were conscripted into the Soviet Army. Only allowed to return home after the war. Then when traveling on a student visa getting married and moving to the US.
The fact is, a lot of Jews (primarily "educated" ones) were rounded up as soon as the Soviets invaded Poland and sent to gulags. They were not saved from any kind of generosity, they were simply rounded up and put into camps along with their families because they were educated or "capitalist's". But they were still concentration camps, and they were made into slave labor. The saving of them was not done form the generosity of the Soviets.