"Divide and Conquer Strategy, also known as “Divide and Rule Strategy” is often applied in the arenas of politics and sociology. In Divide and Conquer Strategy one power breaks another power into smaller, more manageable pieces, and then takes control of those pieces one by one. It generally takes a very strong power to implement Divide and Conquer Strategy. In order to successfully break up another power or government, the conqueror must have access to strong political, military, and economic machines."
Read this New York Times article about it's use in our fisheries.