Joinable smugglers organization.

Just as morrowind had competing criminal organizations, So should we. A smuggling rings that sometimes bumps up against the thieves guild. We could call them 'the dark tide' or 'the night moon' or some such, Khajiitifying the name up.

And while the thieves always say a little of this and a little of that when you ask for thier profession. These guys would say I am a fisherman...of fish, of course...

The guards epsecially in senchal could make a joke that if all the 'fishermen' in senchal ever actually caught fish. the city would be buried in them. And other such things.

As criminal organizations other than the Thieves Guild, there is the skooma dealers of Ya'Tirrje, the Gold Cat whose luxurious villa is in Senchal. He's paying guards to keep the city safe and crime-free. I've suggested to call them "Moonshiners" instead of smugglers because they use moon-sugar to make skooma.
For the name I think about something like Athra Svazeri that you could translate by "Spirit Catcher". It's about using the crystallized soul of the moon-sugar to make skooma but also the mind-slaving inducted by the drug.