The Texas Chainsaw Massacre 4: The Next Generation (1997)

Teenage schoolgirl Jenny and 3 of her school chums are on their way back from the school prom when they have an accident with another motorist on a deserted backroad. Going off in search of help they come accross an old farmhouse which happens to be inhabited by Leatherface and some more of his psychopathic relatives. They are in the employ of some chap called Rothman, who hires them to terrorise people, the reason for this is never explained fully, except that Rothman is part of some powerful terrorist group but there is no attempt made to substantiate the relevance of this plot twist.