Iris Brooks

A band of satanist hippies roll into a town and begin terrorizing the local folk. They rape a local girl and her grandpa goes after them. He fails and is given LSD. This bothers his grandson and he gets back at the hippies by feeding them meat pies infected with blood from a rabid dog. They turn into crazed lunatics and begin killing and/or infecting everything in their path. (imdb)

Parents in a small, conservative community don't think that the sex drive is a normal thing for children to experience. So much so, that they label education in that regard as a communist plot. The group of prudes is led by an impotent alcoholic and a gay policeman. (imdb)