Sorry Mesarthim13, but I just read through the Ardanes, AKA the original set laws of Wicca as set forth by Gardner. It contains the following entry on using harmful magick;
"So it is Ardane, that none shall use the Art in any way to do ill to any. how evermuch they have injured us. And for long we have obeyed this law. 'Harm none' and nowtimes, many believe we exist not. So it be Ardane that this law shall still continue to help us in our plight. ' No one, however great an injury or injustice they receive, may use the Art in any to do ill or harm any.' "