A Letter letter from John McDonnell(Labour) to then Home Secretary Theresa May in July 2014 challenging her to strip any British citizens who served in the Israeli Defence Force of their British citizenship. McDonnell writes:

   “Will you be warning any British citizens considering engagement with the IDF that, in line with established British Government practice (e.g. the deprivation of British citizenship from, to date, at least 40 UK passport holders who have been involved in the Syrian civil war), such engagement may put their British citizenship in jeopardy?”
McDonnell went much further, suggesting that Brits volunteering for the IDF should be classed as “terrorists” as well as being deprived of their citizenship.
Incredibly, the letter was still publicly posted on McDonnell’s website until at least June 2017, almost two years after he became Shadow Chancellor. McDonnell has since deleted the letter, but the internet never forgets…
McDonnell’s position appears to be that Britons with dual Israeli nationality fighting to defend the Israeli state should be stripped of their nationality yet their Islamic State terrorist enemies in the same position should not…


And yet some still argue that antisemitism is not rife within the Labout party .