White Fang Sentiments go back as far as A.C. 140 when the colonies first submitted to Alliance control. One might consider them a militant offshoot of the Colony Autonomy Organization. As early as A.C. 145, violent terrorist acts were being committed in the name of independence. The violence slowed down when pacifist leader Heero Yuy rose to prominence. After his assassination, however, the new Alliance occupation created more hatred than ever, but the stepped-up security forced the rebels to go underground.
A former follower of Heero Yuy, Quinze became a pivotal leader in the colonial independence movement. Originally he advocated pacifism, but perhaps the death of Heero Yuy twisted his spirit. He orchestrated Operation Meteor, which was originally going to involve dropping an actual asteroid onto Earth, wiping it out. The five scientists changed the plan, sending the five Gundams to Earth in order to dismantle OZ and bring peace to the Earth Sphere through less extreme measures. While Operation Meteor could be considered a success, to Quinze and the White Fang, it didn't do enough.
In the chaos following the conflict between OZ and the UESA, Quinze saw a golden opportunity to get the revenge he had long desired. White Fang needed a leader as charismatic as Romefeller's Treize Khushrenada, so Quinze offered the position to Milliaro Peacecraft, aka, OZ pilot Zechs Merquise. Together, they took over the OZ Mobile Doll plant on the lunar surface and built a huge army. They also seized the space battleship Libra and made it their flagship. Its forces assembled, White Fang declared war on the World Nation, OZ and the Gundams.
Amongst the final battle with the World Nation, in a last ditch attempt at revenge, Quinze set Libra on a collision course with Earth, knowing that the resulting crash would destroy all life on the planet. Peacemillion collided with the Libra, saving Earth and eliminating White Fang. In the end, the White Fang party may have been wiped out, but they still achieved their goal of peace in the colonies thanks to the modified Operation Meteor.
Mobile Suit Gundam Wing Technical Manual