Earth Security

Earth Security was a police force in operation on Earth by at least the year 2540. It was a global police force which tended to the security needs of the state headed by the civilian President of Earth. In practice, however, it may have been under the operational control of the military. (DW: Frontier in Space)

According to the novelisation only, Earth Security was a somewhat sinister organization, which denied its prisoners even basic civil rights. Captain Gardiner, for instance, expressed great misgivings about being anywhere close to an Earth Security Cell. While slightly ambiguous in the televised version, the novel makes it clearer that Earth Security is definitively at the service of the military. It explicitly points out that the Third Doctor and Jo end up in an Earth Security cell because of a military tribunal in which there was "no legal representation" and judgments of the court were "final and binding, against which there [was] no appeal".