The Sanderson sisters -- Winifred, Susan and Mary -- are the main antagonists of the movie Hocus Pocus. They are a trio of witches who, after using a potion to suck out the life force of a child and turning that child's brother into a cat, we're captured and sentenced to death in 1693. However, before they were hung, Winifred cast a spell that on a Halloween night when the moon was full a virgin would summon them back so that they claim the lives of the children of Salem.
The Sanderson sisters were shown to be able to curse people with immortality, turn people into cats, raise the dead, curse people with blisters, curse people to dance until they died, and use magic to lure children like a siren. They couldn't step foot in hallowed ground and were either repelled or unable to enter salt or salt circles.
The good news, from what I remember, is that the sisters will have to brew their option before they can use it and in the movie they had to look up how to make it in their spellbook. Which is hopefully still somewhere in Salem.