It was the official title for the group of students who portrayed Chief Illiniwek on campus when I was there in the mid-2000s. They're still around and arranged for a Chief appearance before the MS rededication game this year.
Sometimes wiki isn't the end all be all. This wasn't that hard to find using the right keywords on Google. It's in the third question on the FAQ.
Q: How can you support a racist mascot? A: I don’t support racist mascots; the Chief is not a racist mascot. The Chief is a symbol and that symbol stands
honorthechief.org