When is criticism of Israel antisemitic? A scholar of modern Jewish history explains
Anti-Jewish animosity is certainly not new — it dates to antiquity. The early Christian church attacked Jews for rejecting Christ and blamed them collectively for crucifying him.
The Gospel of John in the New Testament was particularly vitriolic, accusing Jews of being Satan’s children. The fourth century church father John Chrysostom called them demons intent on sacrificing the souls of men.
Medieval Christians added other myths, such as the infamous blood libel – the lie that Jews ritually murdered Christian children for their blood. Other myths accused them of poisoning wells, of desecrating the consecrated host of the Eucharist to reenact the murder of Christ; some even claimed that they had inhuman biology such as horns or that they suckled at the teats of pigs.
https://news.yahoo.com/criticism-israel-antisemitic-scholar-modern-133435024.html