Anti-Semitism in the British Labour party goes way beyond criticism of Israel's foreign policy.
It is a deep-seated poison going back many decades in the left wing of the party that has been unleashed by the rise of Jeremy Corbyn and his grassroots organisation Momentum.
Mostly it is revealed on social media but frequently spills out into the real world. There are literally thousands of examples.
Corbyn is personally anti-Semitic of this I have no doubt.
He does not think that anti-Semitism is racist since in his mind racism is only possible towards weaker groups.
See 'The Lefts Jewish Problem' by David Rich for a thorough account of the history and depth of this issue and for evidence of Corbyn's personal culpability.