DATS (Digimon Data Squad/Digital Accident Tactics Squad)
DATS is an organization dedicated to keeping the peace between the human and Digital Worlds, by stopping any Digimon that appears in the real world, and returning it to the Digital World in the form of a Digi-Egg (digitama). DATS is apparently a worldwide organization, as Thomas was known to visit the European branch prior to episode three. It is unknown if there is an American branch, or one elsewhere, but the majority of Digimon activity occurs in Japan. The Japanese branch, at least, falls under the direct jurisdiction of Japan'sConfidentiality Ministry.
Due to the manipulation of Akihiro Kurata, the core team of DATS operatives in Japan was broken up, and the building that housed DATS was annihilated. In later episodes they operate secretly from underground after the core team of DATS comes back together, though not officially. After the Partner Digimon (including Biyomon), Gotsumon and Marcus Daimon returned to the Digital World, DATS is permanently dissolved and five years later most of the members of DATS have moved on and have jobs at the local police station, except for Thomas who cures his sister's illness and wins a Nobel Peace Prize and Marcus, who stays in the Digital World with Agumon as a sort of peacekeeper.