Comment by ayngg

I don't think this is limited to Russian oligarchs, I thought that because of its trust and crown dependencies system, London is a popular place for people to hide this kind of stuff. Russian oligarchs and other unsavory individuals like corrupt leaders in Africa, the Middle East and the developing world all dump their ill gotten gains into the opaque system away from prying eyes. The stuff you can actually see, like mansions in Knightsbridge are probably just the tiniest tip of the iceberg, everything else is held in such opaque ways that nobody even knows who it actually belongs to. It is so blatant that you couldn't really call it a dirty secret.