United Nations

The United Nations (UN for short) functioned as a coalition of Earth nations, which also created international campaigns and programs. The UN co-ordinated many of these efforts from Geneva in Switzerland.

In the late 20th century, the UN put together the United Nations Intelligence Taskforce (later the Unified Intelligence Taskforce) in order to defend the Earth against threats such as the Great Intelligence (DW: The Invasion et al). This was done due to direct appeal by Alastair Gordon Lethbridge-Stewart. (MA: ''Who Killed Kennedy)

In the first decade of the 21st Century, due to an unspecified incident, the UN possessed the launch codes for the United Kingdom's nuclear deterrent. (DW: World War Three) Due to a sharp increase in alien incidents, the UN increased funding for UNIT under a policy of "homeworld security". (DW: The Sontaran Strategem) It also went into emergency session when faced with apocalyptic events like the Moon heading towards Earth. (SJA: The Lost Boy)

In 2009, the United Nations surrendered the Earth in the face of a massed Dalek assault.

Behind the Scenes
After the broadcast of Aliens of London, it was announced that the United Nations were no longer happy to be directly associated with UNIT. The term "UN" could, however, be used as long as it wasn't stated what it stood for.

In 2008, UNIT was renamed the Unified Intelligence Taskforce.