Abigail accuses John Proctors wife of being a witch because she wants John all to herself, and so everyone believes Abigail, and there are more people that must confess to witchery or else they shall be hung. Because of Abigail, John is hung because he denies being "a witch" and Elizabeth confess to being "a witch" and so she watches her husband get hung.
And it is a downright mockery to talk to women of their enjoyment of the blessings of liberty while they are denied the use of the only means of securing them provided by this democratic-republican government - the ballot.