The "Organisation for Economic Cooperation and Development" or OECD released a "blacklist" of global tax havens at yesterday's G20 summit in London. The Philippines, Uruguay, and Costa Rica were listed as three of the four worst offenders. For today's Geo Quiz, we're looking for the fourth. The answer is the Malaysian federal territory of Labuan. Anchor Katy Clark speaks with Tom Cardamon of the Global Financial Initiative at the Center for International Policy in Washington to find out more about how these international tax havens operate.