As much as i'd like to wow people with a stellar reason as to why the Gaians buddy up w/ a couple of Kusari factions, the simplest bottom line answer during a time of war is that 'The enemy of my enemy is my friend' & from our perspective they are more 'green oriented' than the Bretonians & the lesser of two evils.
After Bretonia has their rumps handed to them & the war ends, we will see what happens after Kusari install their puppets into office.
As far as the AFA alliance, Zel said it best & i'd just be redundant to add more to it.
Now, I will say that in my mind, it is not the Gaians ultimate goal to simply clean up Bretonia...It's a major goal to be sure, but the primary purpose of the faction is to force Bretonia to not mess with the natural order of evolution.
Back in the day, the Gaian movement started as a small group of Cambridge-based scientists studying Gaia's unique ecology, & became digruntled at the government for opening up a tourist industry in Edinburgh that they felt interfered with not only their work on the planet, but also that an abundance of human presence on the surface would horribly scar the planets' natural balance. It ended up getting to the point where a number of them began to sabotage tourist transports, only after their constant pleas to the beaurecrats for stoppage was ignored.
Later, when BMM began to lobby the Bretonian government for mining rights on the surface of Gaia, something in them began to snap, & people began to die while Gaian propaganda started to become a common sight from one end of Bretonia to the other, as the Green Front came into existence. Their lobbying power, coupled with the governments desire to put priorty on tourisim, forced BMM to eventually abandon their efforts.
Emboldened by that, & viewing it as a major victory for the movement, their numbers expanded with an influx of members with increasingly radical ideology as they constructed their hidden base & expanded their efforts beyond Gaia to include resistance to the terraforming of planet Ayr on the other end of the system. One thing led to another until they eventually became the bane of the Planetform corporation & BMM as a whole. For a while, life was good.
...Then the Corsairs took notice & ruined the movement by throwing money at us.
As much as the 'grass roots' Gaians tried to block the forming alliance, they couldn't stop the Zeitgeist as their numbers exploded with an oversaturation of rebels without a clue.
Enter the NLH:
In a nutshell, the NLH exists to give the Zeitgeist a swift kick in the teeth & get the eye of the Gaian movement back on the ball.