Gabrial Atanna

Gabrial Atanna was the Imperial Senator from the planet Esseles, until the Emperor dissolved the Senate just before the Battle of Yavin. Senator Atanna was replaced by Moff Jander Graffe, and Atanna went into hiding. The Alliance launched an effort to rescue him, since Senator Atanna had been a spy for the Alliance during his tenure. Atanna and his entire family were moved to an Alliance safeworld.

Source
Star Wars Adventure Journal, Number 3 & 7