I remember that at least as far back as the late seventies the Calhoun College dining hall had a number of stained glass windows depicting the life of John C. Calhoun. One had an image of a slave crouching, hands upraised with his wrists in shackles. Some years later that particular image was exised and replaced with a plain pane of glass. I recall seeing the censored pane a few years ago when I had lunch there with my daughter. Now, of course, the College has been renamed Hopper College, and it wouldn't surprise me a bit if the whole series of panels are gone.
I remember the Indian and Puritan gargoyle well. The library is festooned with dozens of them. If I recall the stonemasons back the thirties - true artists imported from Italy, I believe - were turned loose to vent their imaginations, and some of gargoyles are quite humorous. Note that this sculpture presents a battle between Puritan and Indian - the Indian is armed with his bow, the Puritan his musket. For the remainder of time, it won't be a fair fight - the Puritan has been disarmed, and the Indian remains poised to vanquish his foe.