The Mini Skirt Mob

The MiniSkirt Mob is a 1968 action film about a female motorcycle gang. The film was directed by Maury Dexter, and stars Diane McBain, Jeremy Slate, Sherry Jackson, Patty McCormack, Harry Dean Stanton and Sandra Marshall.

The harassment backfires when Shaynes sister Edie is accidentally killed by a Molotov cocktail and when Shayne herself ends up hanging by her fingernails off a cliff.

Source: Wikipedia