"Class Reunion Massacre" is a 70s slasher horror flick, also known as "The Redeemer". A killer of many disguises targets six adults based on their sins committed.
It's not the greatest film, but it's an interesting movie in the sense that it uses the popular religious theme, as many a 1970's horror film did, post "Exorcist". However, it also showcases the typical killer-in-a-mask stalking people, which became easy money for horror in the 1980s. The film has its bizarre and even creepy moments that stick out, such as how the killer uses different masks and costumes upon attacking his victims each time.
If you're looking for an oddball slasher horror film for your entertainment, give this one a view.