"We may one day be the Party of anti-racism once again but it certainly isn't today," the former Labour Party general secretary writes in his resignation letter
#newsnight
"As an Armenian survivor of the Armenian genocide, I have zero tolerance to anti-Semitism, Islamophobic or any other discrimination against religion or race."
He told #newsnight that "this decision has not been taken lightly".
"It is not just the policies on foreign affairs... not just Brexit vacillation... but the overt anti-Semitism that permeates the Party machine..."
"Labour is taking decisive action against antisemitism, doubling the number of staff dedicated to dealing with complaints and cases," it said
#newsnight