There's no shortage of historical incidents that at least a few people have tried to pin on ergot, some of which seem somewhat plausible (like when people ran around seeing angels for a few hours during the Munster Anabaptist rebellion) and some of which are rather less so (like the Salem Witch Trials, which lasted for months). Is there a historical consensus on the truth of the matter? Has the influence of ergot been overblown?
/u/idjet has majestically addressed the basis of your question here, with specific reference to ergot's claimed culpability in the early modern witch craze.