The Interstellar Agricultural Aid Commission or I.A.A.C. is, as its name suggests, an interstellar organisation which specialises in providing agricultural aid. Technically they are part of the private sector but they work closely with the United Federation of Planets on many projects.
In 2376, Keiko O'Brien joined the IAAC and was posted to Cardassia by Charles Drury to oversee the Andak Project. The position required Keiko, Miles and their family to live on Cardassia for two years. (DS9 novel: Unity, DS9 - Worlds of Star Trek: Deep Space Nine novel: Cardassia: The Lotus Flower)