What is an antagonist in The Crucible by Arthur Miller?

The primary antagonist in the play "The Crucible" by Arthur Miller is Abigail Williams. She is a young woman who falsely accuses several innocent people of witchcraft, including John Proctor's wife, Elizabeth. Abigail's motivations are complex and include a desire for power and revenge against those she perceives as threats to her position in the community. Her actions set in motion the events of the play, leading to the tragic deaths of many innocent people.