The Galactic Alliance was an organising body of the Mutter's Spiral.
A member of the Slitheen family, impersonating Ambassador Rahnius, came to Sarah Jane Smith, claiming that he was sent to give her an award for her good deeds. (TV: From Raxacoricofallapatorius with Love)
Bill and his partner Bott were undercover Galactic Alliance members. (PROSE: Martha in the Mirror)