There are a bunch of outfitters that go into the Thorofare. Some go in from the Cody side and some from the Jackson side.
As mentioned Hidden Creek is Bill Perry, I think Gary Fales is now Wyoming Expeditions, then there is Isawooa, Open Creek, Bliss Creek and many others.
I hunted there about ten years ago with Butte Creek Outfitters. I hadn't heard about them being caught poaching but I wouldn't have recommended them anyway.
It's certainly a wilderness adventure. I was in there about September 10th and I thought this was too early. Was expecting a rut hunt and they weren't bugling yet. They were starting about the time I left.