I agree Gabriel, people generally don't work well under real bad stress and you know there's women, like me, who wouldn't let anyone treat them like a slave and men who wouldn't treat their women like that so I think the fort is an exception.
I remember 4 slaves, the Weathers family which is going through process and are currently "captures" which means their final destination and treatment when the get there is unknown.
Then we have two slave woman carrying a crapload of stuff on their backs, these women are treated badly, but who knows? Maybe they are doing it because they've refused to work and tried to run away. (This is pure speculation but I hope that within the Legion community the slave class system works like this: If you're good, you will get better treatment and might eventually become a citizen, if you're bad and work like crap then your treatment will get worse and you'll end up like these two slave girls. Why I hope it is like this is because then the slaves has no one to blame but themselves for getting such horrible treatment, while good little dogs will get far better treatment.)
Then we have a little girl, I haven't talked to her so I don't know what there is to her.
Then there's Siri, and she seems to be treated all right, she makes them healing powders and she don't look like she's in pain or anything. (Physically that is, mentally? I dunno, haven't talked to her for a while so can't tell whether her voice is full of despair or not.)
Still, the only four slaves I've seen are the four at The Fort and the captures at Cottonwood Cove.
Might be some more slaves at The Arena, but that was quite a long time ago since I fought there and their only purpose is to die by the players hands anyway.
Point is, in the game we have 1 citizen, 3 captures, 2 prisoners, 4 slaves and a crapload of legionnaires.
I know I'm rehashing the same thing but, how are we suppose to debate Legion when it's this biased?
Look at how many citizens of New Vegas and NCR there is, Legion is... Incredibly difficult to defend unless one allows speculation.