The Pom Pom Massacre (1970)

Sinopsis

The cheerleaders of Armadillo High party hard and cheer harder but they feud amongst themselves more than with rival teams. Things really heat up with the arrival of the new girl, Tammi, who, unbeknown to anyone, has ties to their town's dark past. That past rears its gory head on a team-building trip to cheer camp. Now the girls have to fight for their lives against a sadistic bloodthirsty killer with one purpose: Cheerleaders must die.