Right. Drop the slaver idea. But how do I join a cool mob like the ones at the Desperado or the Shark Club?
Warning: Spoilers, but Spoiler-Lite.
The Mordino's seem to have a strength (or other stats) requirement to be offered the missions.... And make sure you talk respectfully to Senior Mordino, otherwise he wont invite you to join. You'll need to do some easy gopher work. The Mordino's, despite beign ex slaves, have no problem with slavers, and will buy slaves.
Salvatore's - Just hold your ground with Mason, Slavers OK. You'll need to do some gopher work, and part of it will need decent speech skill. Again, be respectful otherwise Salvatore will not offer you the final (very easy, but absolutely required) mission.
Bishop - You need to get the case from Tomcat Moore in Vault City, And not ask him for compensation. Tomcat Moore will not give his case to a slaver (either get it first, or you cannot go this route). Bishop's gopher work will send you far and wide, and IMHO is much harder than Mordino and Salvatore. If you are going to go the Bishop route, and want to become captain of the vault city guard, become the captain first, otherwise this will be locked off to you.
Wright - Talk to Keith(?) Wright in the Railway station. No Slavers. Two missions required to gain entry, the first you can just make up an answer for and not complete properly (but its better if you do!) and the second is difficult without resorting to using psycho.
You can "Resign" from a family by eliminating their head. Eliminating all families will unlock a seperate ending for reno.