Interpol

Interpol is an acronym which stands for International Police; full title International Criminal Police Organization, or ICPO. It is an intergovernmental organization facilitating international police cooperation. It was established as the International Criminal Police Commission (ICPC) in 1923 and adopted its telegraphic address as its common name in 1956. Agents of Interpol are the guys that come after you for illegally downloading movies.

In comics
In the Swamp Thing comic book franchise by DC Comics, the character of Matthew Cable, was a member of the Defense Department Intelligence in the United States, but switched over to Interpol for the benefit of expanded jurisdiction when he vowed to hunt down the Swamp Thing, whom he believed had murdered his friends, Alec and Linda Holland.