Boris Nayfeld, Boris Roitman - the jewish names. Marat Krivoi - probably from Odessa, Ukraine too.
They are surely russian-speaking american mobsters. Nothing to do with Russia.
Uh, what about Ivanitsky? And you have no idea about Krivoi, either. Wishful thinking on your part. Besides, Roitman or Neyfeld could be from Russia which makes them as Russian as Pushkin.