The description in our database for this photo is "President Campbell accosted by 'gorilla'." I have no evidence to disprove this theory so will assume Dr. Ralph Campbell was simply on his way out of the Administration Building for a meeting when he was unsuspectingly and irrationally harrassed by this 'gorilla' who was, I assume, wreaking havoc on campus that day.
Whatever differences President Campbell and the 'gorilla' had seemed to be put behind them moments later when he appeared to offer the bearded gentleman on the right as a sacrifice to the 'gorilla' and the three of them posed to capture the moment for posterity.
This posting continues a disturbing trend I'm noticing in our photograph collections of costumed hooligans. See :
Source: University Relations and Information Office fonds (PC 80, A83-52), Box 1, Folder 6, Items 1-2
Date: April 7, 1977