Most of the Russian Mafia in New York is ethnically Jewish, plus some Georgian groupings. But most are Jewish. This does not make it a "Jewish Mafia" as such, but if one wanted to cite examples of Jewish gangsters, both past and present, then it is surely reasonable to mention the Russian Mafia in New York.

Again, can you cite a source or authority for your claim that Marat Balagula was not Jewish, or that most of the men he employed were not Jewish?