Instead of having the victims be the stereotypically unlikable annoying teen campers, it would be a bunch of even less likable adult (mid-age and generally older) libs and neocons, behaving much the exact same ways while "roughing it" out in their summer cottages by the lake, with all their hired help and underlings. Maybe it would be Camp David or some other hotspot of evil.

To add onto the horror movie tropes, the specter of communism can take the form of some foreign dignitary or hired help they had killed and dismembered by the lake a few decades back, out for revenge and inciting the plebs to do so in ironic ways while improving their lives and teaching praxis in the process. There can be a "horror" scene which is actually just some ghoul getting absolutely demolished by the people they mistreated on a daily basis, at a struggle session.