Anti-Alien League

The Anti-Alien League was a group formed by Gorton Colu, a resident of Taris. He believed that humans were superior to aliens, and that all aliens should be killed. Though authourized by both the exhange and sith, he stirred up troubble with the locals who shared hatred of aliens but felt this very extreme.

Old Republic
The memory wiped Revan encounters Gorton Colu, preaching his racism in the Upper City. Revan criticizes him for hate-mongering and ignorance and moves on, or if the player chooses dark side, agrees with him. Mission and Zaalbar taunt him. He speaks of "vermin invaders" repeatedly, echoing throughout the streets as Revan and his allies walk in the Upper City.

Fate
The fate of the Anti-Alien League is unknown, but it's founder, Gorton Colu, almost certainly died in the Sith Assault on Taris ordered by Saul Karath

Appearances

 * Star Wars: Knights of the Old Republic