As far as I know, the authorities in Hurm are battling against pirates and slave traders and have done so for quite a while now, and one Sallaron Tempest's WLDQ was related to this as well (or so I believe).
The last time I visited Karthy (Katherian) there was this slave trading compound there, not on the docks district but on the other area of the city, so at least Morholt Kingdom seems to approve of slavery, to what degree? I know not. But that is Alindor, not Mistone, West server still, though.