Robert Porter

A pretty young teacher and four of her pretty students take a minibus to some Navajo ruins, little suspecting another kind of ruin awaits. A trio of bikers begin to flirt with the gals, and when their bus breaks down, they helpfully tow the vehicle to a deserted shack. The chief biker, Al, chews up the scenery, kills folks, and rips off the teacher's clothes before raping her. The poor schoolgirls are also in for their share of abuse. (imdb)

When the police discover that their motorcycles are concealing heroin, Waco and his motorcycle gang hides out in a desert convent. A highway patrolman hunts down the gang after they kidnap a nun, Sister Anna and flee the convent. Soon Waco and the young nun fall in love and she is forced to decide whether or not to leave the church for him. (imdb)