Who is Abigail Hardy?

Answer:

She is a character from the Crucible, who is 16 years old & had an affair with John Proctor. She's one of the bunch of girls who started the Salem witch trails.

The Historical Answer

Abigail Williams was the girl who started the Salem Witch Trials (in real life) by pretending to be bewitched, and so named various people (most of whom, at least in the beginning, where family rivals and whom hated the Williams family). She was later found to be lying, after 19 innocent people were killed.