Is there data supporting this: "ethnic cartel who refuses to hire anyone but their own people"? I've worked with plenty of folks from this "ethnic cartel" in my chain of leadership and my anecdotal experience is nothing of the sort.
Good luck, you'll just get sinister vagueposting like "If you know you know" because it's much easier to spread these claims without the burden of actual evidence that could undermine the unfalsifiable "common knowledge".