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The Institute for Global Advancement, the IGA, is an agency that appeared before The Arrival. It operates on behalf of The Hosts. Agents from the Institute for Global Advancement recruited Alan Snyder.

The agents who recruited Alan Snyder were later seen in the L.A. FBI office.

They Institute used Everett Kynes' algorithm to recruit people for the Transitional Authority.

The Institute for Global Advancement shares an acronym, IGA, with the Interim Global Authority. There's no explicit link, but it may be that the name "Institute for Global Advancement" was only used until The Arrival and the organization turned out to the Interim Global Authority.