These slides are all mixed up, so I've been trying to sort them into the original batches. I can only do this when I can find some distinguishing mark on the slides themselves, or by the images.
I think these are actually Kodachrome slides processed by Technicolor. The colors are extremely darkened, and it does not help any that the original was not well-exposed to begin with; here is part of an uncorrected scan:
It makes the image look posterized to bring up the brightness in the foreground, but at least you can see who it is:
I'm pretty sure this is H. Harrison Clarke, Marcella Armstrong's brother. Now that I have the batch put back, though, I can make sense of some of the people I didn't recognize at first. When I get through the rest of the slides, I'll go back and try to identify everyone.