Well, for starters some common stomping grounds, communication wise. Something to form a few tighter bonds In Character and Out of Character. The following are just ideas, I do not have the resources nor skills needed to actually realize any of the following:
* Some IC and OOC forum for Anti-slavery/Matari debates, talks, planning and events and so on. Or just IC and use Backstage for the OoC stuff. Make it a more public thing than it is right now, hidden in various internal chats and corp/alliance forums. Stir interest, get debates, get ideas and balls rolling.
* An RP bar. (Yes, I can hear you groaning, but some people like them. I'm sure there's hardliners that enjoy it as well.) Name it... the Khumaak or something like that. Somewhere that hardliners when it comes to anti-slavery can RP and enjoy themselves and know they won't have to keep RPing as hostile or have to ignore half the channel list for being slavers or slavery supporters. Make it as inclusive as it can be, by making it VR or something like La Maison used to be, letting people who are immersionists that never leave the pod still join in.
* A discussion/debate channel similar to the Summit or similar venues, for these people. Not needing to dodge/face Sansha/Blood Raider/Empire Loyalists/Slavers at every turn and letting debates either turn hostile or just be the same old tit for tat that never goes anywhere. Discussing which lines can't be crossed, who is doing what, getting your own organization or people promoted and so on.
I am not proposing a new corp, or new alliance. There's already too much fragmentation going on, and starting even more from scratch at this point is almost entirely pointless without even having some kind of cohesion or common interest to begin with.