Went to the Ringling Brothers here a couple years ago. They had a young elephant in a small pen near the picnic benches. It was already insane, pacing the same track over and over. Heard they got hit with fines and gave them up shortly after.
I know the Madison zoo had to get rid of theirs too because they couldn't take care of them properly (after decades of having them!). Went to a sanctuary, and the first chance it got it grabbed and killed a worker.