Because radio communication depends on a clear channel, free of interference, spectrum has to be strictly rationed. Much of this rationing is handled by national regulators such as the FCC (Federal Communications Commission) in the United States, but there is an increasing trend towards international cooperation. This is needed both to handle the long-range frequencies that can spread across international boundaries and to promote compatibility between systems in different countries.
The international body responsible for radio spectrum is the ITU (International Telecommunications Union). Though an agency of the United Nations, it actually predates the parent organization by nearly a century. It was founded in 1865 to ...