Well that's a long topic. Brysing would be the best person to ask, but he's been offline for a while, so maybe ask in 'other paths' [unless this gets moved by a mod, in which case ignore my point]
Now by 'Witchcraft' what do you mean exactly? Many paths study Witchcraft, not all are the same. Also 'Witchcraft' isn't a spell casting craft for some, so are you talking about the pop culture view of a coven casting spells, or the path of Witchcraft where you observe the seasons and whatnot?
Anyway, as far as I can tell, Witchcraft was one of the oldest crafts, they were wisepeople who could help when you were sick or was having trouble with crops. Eventually the rise of Christianity condemned anyone who didn't follow the Church's preaching, this included Druids and other Pagans, and Witchcraft. After that it became a scare fest with people telling tall tales about witches flying on broomsticks and working with the devil, people got tortured and killed, later on Salem Witch Trials happened [fascinating read, you should research the witch trials if you get the chance] finally the world started coming around and many places made Witchcraft and Paganism legal, but there are still groups and countries that hate witches and cling to the negative stereotype. [Look up African Witch Trials]
That's just a quick point by point, what exactly did you want to know so I [or someone more knowledgeable] can explain in more detail?