An example of a way to gain slaver reputation should be to kill Real Players that are vilified by Slavers Guild and each you kill will gain a +10 Reputation.A other example could be to hunt down and kill slaves that managed to escape and by doing that you gain Slaver reputation.
Chi si ritira dalla lottaE' un gran figlio di mignotta!
I don't agree there are only a few thing that is sorry you lost no second chance in the game.
I currently have one possible idea for joining the Raider faction through Slavers. Ever tried to help up a wounded Junktown Scout? I have helped a wounded Junktown Scout and gained a +2 reputation with them.