I know there was an article called Stalin's Jews in some kind of Jewish media meant for Jewish consumption, before Jews shut down all criticism of themselves. Haven't read it, but I've seen it mentioned a few times and have read a synopsis of it. The author apparently tries to pretend these Jews weren't motivated by being Jewish or any kind of an ethnic agenda, but the argument is weak and not particularly believable, whereas the evidence he lays out about how massively Jewish the Cheka and other segments of the Bolshevik and Communist state security apparatus was, is overwhelming, along with laying out how Ghengrik Yagoda and Lazar Kaganovitch were 2 of the worst mass murderers in human history. There have been articles on Unz and Occidental observer about the subject as well.

Kaganovitch was probably the man most responsible for the policies that directly led to millions of deaths. At best he was to the Holodomor what Himmler was to "the holocaust", and at worst he was almost completely responsible. Stalin of course eventually had Yagoda executed after he allegedly caught Yagoda colluding with other Jews to undermine him. Stalin might have been paranoid, but that doesn't mean he was wrong about all the people he accused of trying to get rid of him. I believe Kaganovitch himself later claimed he was involved in poisoning Stalin and bringing about his death, so apparently Stalin still wasn't paranoid enough.

One thing to ask the person your debating, is why you don't ever hear Jews speak about Jewish victims of the Holodomor? It's aguably the greatest genocide in history, and yet Jews are completely silent about any Jewish victims. This from a group that talks about alleged pogroms that happened over a thousand years ago like they happened yesterday.