What is institutional anti-Semitism? There's probably a definition somewhere, but for me, it would mean that the organisation in question, is more sluggish to investigate Jew hatred, than it is of other forms of racism. It might also mean that punishments for Jew hatred are lighter than for other forms of racism.
So is the Labour party institutionally anti-Semitic? I don't have enough information to be able to form a judgement, but I think the way to find out, is to look at complaints of anti-Semitism, and complains of Islamophobia, and see if there's a difference in how long it takes to investigate. I would also want to compare the weight of sanctions, but that's more difficult, because how can you compare like with like.
The Equalities and Human Rights Commission have decided to investigate the Labour party. I hope that they can finally excise the cancer of anti-Semitism from the Labour party - if indeed there is institutional anti-Semitism, and if it is possible to cut it out.