Sleepaway Camp (also released as Nightmare Vacation) is a 1983 American slasher film written and directed by Robert Hiltzik, who also served as executive producer. The film tells the story of a young girl and her cousin who are sent to a summer camp, where a group of killings begins shortly after their arrival. It stars Felissa Rose, Jonathan Tiersten, Christopher Collet, Karen Fields, and Mike Kellin in his last screen appearance.
I know since it won a bunch of Oscars people like to call it a thriller but one character eats people, and another skins them alive and wears their skin as an outfit. I am going to go with a horror film for this one.